I found this post on the general discussion forum, posted by RagingIdiot. I don't know why but I found it very interesting.

1. Which Clan can produce units the fastest? (This is at the fastest speed setting)
Serpent, all serpent units are produced faster than the other clans counter parts.
This seems to be a bug, as I find no reason to give Serpent this advantage. Here are the Build times.

Dragon
Tier 1 17 seconds
Tier 2 20 seconds
Geisha 24 seconds
Tier 3 31 seconds
Tier 4 None

Lotus
Tier 1 17 seconds
Tier 2 20 seconds
Channeler 24 seconds
Tier 3 31 seconds
Tier 4 20 seconds

Serpent
Tier 1 13 seconds
Tier 2 17 seconds
Fan Geisha 20 seconds
Tier 3 26 seconds
Tier 4 Instant

Wolf
Tier 1 17 seconds
Tier 2 20 seconds
Pack Master 24 seconds
Druidess 24 seconds
Tier 3 31 seconds
Tier 4 Instant

2. Which Clan has the lowest unit production cost over all? Well that would be Dragon.

Clan Total Unit Cost
Dragon Rice Water
Archer 30 30
Spearman 30 30
Chemist 30 30
Geisha 30 30
Dragon Warrior 60 60
Kabuki Warrior 60 60
Powder Keg Can 60 60
Samurai 90 100

Clan Total Unit Cost
Lotus Rice Water
Leaf Disciple 30 30
Staff Adept 30 30
Blade Acolyte 30 30
Channeler 30 50
Infested One 60 60
Diseased One 60 60
Unclean One 60 60
Warlock 90 75
Master Warlock 180 150

Clan Total Unit Cost
Serpent Rice Water
Swordsman 30 30
Musketeer 30 30
Crossbowman 30 30
Fan Geisha 30 30
Canoneer 60 60
Bandit 60 60
Raider 60 60
Ronin 90 105
Necromancer 360 420

Clan Total Unit Cost Discounted Cost
Wolf Rice Water Rice Water
Mauler 30 40 30 40
Hurler 30 40 30 40
Brawler 30 40 20 27
Pack Master 30 30 30 30
Druidess 30 30 30 30
Pitch Slinger 60 90 60 90
Sledger 60 90 50 74
Ballistaman 60 90 50 60
Berserker 90 150 50 91
Werewolf 123.3 166.6 83.3 107.66

3. Which Clan has the highest unit production cost over all.
Well it looks like Wolf to me. But if Lotus makes nothing but Master Warlocks I can see the expense rising quickly.
Note that Serpent has the single most expensive non Zen unit but they can only make 1 so i don't think that should be counted .

4. Which Clan has the lowest unit production cost when giving each unit a Battle Gear.
Well as long as you ignore peasants Lotus does. If you count peasants as a cost then it would be Dragon.

Clan Battle Gear Cost Battle Gear Cost
Dragon Battle Gear 1 Building Rice Water Battle Gear 2 Building Rice Water
Archer Zen Arrows Shrine 15 5 Fire Arrows Fireworks Factory 30 10 Spearman Stun Strike Shrine 25 10 Whirling Spear Fireworks Factory 25 10 Chemist Mandrake Spores Shrine 25 10 Starburst Rock Fireworks Factory 25 10 Geisha Sacrifice Shrine 25 10 Fire Shield Fireworks Factory 25 10 Dragon Warrior Chi Shield Shrine 25 10 Flaming Sword Fireworks Factory 30 10
Kabuki Warrior Stardust Shrine 25 10 Flash Powder Fireworks Factory 25 10
Powder Keg Cann Indirect Fire Shrine 25 10 Shrapnel Keg Fireworks Factory 25 10 Samurai Yang Blade Shrine 40 20 Dragon Skin Fireworks Factory 25 10

Clan Battle Gear Cost Battle Gear Cost
Lotus Battle Gear 1 Unit Rice Water Battle Gear 2 Brother Rice Water
Leaf Disciple N/A Peasant N/A N/A Scrye Leaves Tausil N/A N/A
Staff Adept N/A Peasant N/A N/A Dark Canopy Tausil N/A N/A
Blade Acolyte N/A Peasant N/A N/A Inner Strength Tausil N/A N/A
Channeler N/A Peasant N/A N/A N/A Tausil N/A N/A
Infested One Famine Peasant N/A N/A Rebirth Tausil N/A N/A
Diseased One Death Wail Peasant N/A N/A Projectile Vomi Tausil N/A N/A
Unclean One Death Sentry Peasant N/A N/A Spreading Goo Tausil N/A N/A
Warlock N/A Peasant N/A N/A Life Siphon Tausil N/A N/A
Master Warlock N/A Peasant N/A N/A Unlife Tausil N/A N/A
Clan Battle Gear Cost Battle Gear Cost
Lotus Battle Gear 3 Brother Rice Water Battle Gear 4 Brother Rice Water
Leaf Disciple Scrye Leaves Sehk N/A N/A Scrye Leaves Lythis N/A N/A
Staff Adept Dark Canopy Sehk N/A N/A Dark Canopy Lythis N/A N/A
Blade Acolyte Inner Strength Sehk N/A N/A Inner Strength Lythis N/A N/A
Channeler N/A Sehk N/A N/A N/A Lythis N/A N/A
Infested One Rebirth Sehk N/A N/A Rebirth Lythis N/A N/A
Diseased One Projectile Vom Sehk N/A N/A Projectile Vom Lythis N/A N/A
Unclean One Spreading Goo Sehk N/A N/A Spreading Goo Lythis N/A N/A
Warlock Soul Chill Sehk N/A N/A Dark Arson Lythis N/A N/A
Master Warlock Ephempher Corri Sehk N/A N/A Soul Thresher Lythis N/A N/A

Clan Battle Gear Cost Battle Gear Cost
Serpent Battle Gear 1 Building Rice Water Battle Gear 2 Building Rice Water
Swordsman Glass Sword Metal Shop 50 50 Mugging Thieves Guild 25 15
Musketeer last Shot Metal Shop 25 10 Sniper Scope Thieves Guild 50 75
Crossbowman Phosphorous Bo Metal Shop 15 10 Weakness Bolts Thieves Guild 25 10
Fan Geisha Razor Fans Metal Shop 25 10 Dark Pact Thieves Guild 25 10
Canoneer Mines Metal Shop 25 10 Smoke Bomb Thieves Guild 25 10
Bandit Paralysis Darts Metal Shop 25 10 Stealth Thieves Guild 25 10
Raider Caltrops Metal Shop 25 10 Brush Fire Thieves Guild 25 10
Ronin Yin Blade Metal Shop 35 15 Blood Bond Thieves Guild 30 15
Necromancer N/A Metal Shop N/A N/A N/A Thieves Guild N/A N/A

Clan Battle Gear Cost Battle Gear Cost
Wolf Battle Gear 1 Building Rice Water Battle Gear 2 Building Rice Water
Mauler Shale Shalery 30 15 Wreaking Ball Druidess 33.3 16.6
Hurler Shale Shalery 30 15 Lava Rock Druidess 33.3 16.6
Brawler Shale Shalery 30 15 Zen Counterpunch Druidess 33.3 16.6
Pack Master Shale Shalery 30 15 Wolf Howl Druidess 33.3 16.6
Druidess Shale Shalery 30 15 N/A N/A N/A N/A
Pitch Slinger Shale Shalery 30 15 Scorched Earth Druidess 33.3 16.6
Sledger Shale Shalery 30 15 Stun Slam Druidess 33.3 16.6
Ballistaman Shale Shalery 30 15 Totem Druidess 33.3 16.6
Berserker Shale Shalery 30 15 Lycanthropy Druidess 33.3 16.6
Werewolf N/A N/A N/A N/A Wolf's Bite Druidess 33.3 16.6

5. Which Clan has the highest unit production cost when giving each unit a Battle Gear.
Who else but Wolf. For some reason Wolf seems to get the worst costs and then given the ability to upgrade costs with yin, what a rip in my opinion. For 2 yin Wolf can lower the cost of the BG gained from the Druidess from 33.3 rice and 16.6 water to 20 rice and 10 water wich is lower than almost any other BG besides the free ones Lotus can get (yes I know it is not really free but fighting is a good way to go for the economy).

6. Which Clan has the lowest building production cost.
Well this one is interesting.
I expected a different Clan to be lowest but since Wolf has 1 less building I guess it makes sense. But notice that Lotus has only 12 buildings also. Also look at the prerequisites for Lotus to build their buildings, hmmmmmmm I wonder why they like to turtle.
Notice that Serpent has the lowest cost if you remove the Necromancers Throne from the overall cost.

Building Rice Water Prerequisite 1 Prerequisite 2 Prerequisite 3
Peasant Hut 50 0 N/A N/A N/A
Combat Pit 125 50 Peasant Hut N/A N/A
Ballistic Grou 75 125 Peasant Hut N/A N/A
Quarry 150 25 Peasant Hut N/A N/A
Tower 50 0 Peasant Hut Wollfball Court Keep
Vitality Garden 50 150 Peasant Hut N/A N/A
Wolfball Court 150 300 Wolves Den N/A N/A
Keep 600 350 Cairn Shalery N/A
Wolves Den 100 200 Combat Pit N/A N/A
Shalery 250 100 Well Quarry N/A
Cairn 100 200 Vitality Garden Quarry N/A
Well 125 0 Hut N/A N/A
1825 1500
Total 3325

Building Rice Water Prerequisite 1 Prerequisite 2 Prerequisite 3
Peasant Hut 50 0 N/A N/A N/A
Tavern 50 100 Peasant Hut N/A N/A
Sharpshooters G 100 50 Peasant Hut N/A N/A
Alchemist Hut 75 75 Peasant Hut N/A N/A
Tower 100 0 Peasant Hut Town Square Keep
Bathhouse 75 150 Peasant Hut N/A N/A
Town Square 150 75 Bathhouse N/A N/A
Keep 500 550 Town Square Metal Shop N/A
Stables 100 125 Tavern N/A N/A
Metal Shop 150 100 Sharpshooters G N/A N/A
Thieves Guild 200 0 Alchemist Guild N/A N/A
Necromancers Th 400 300 Thieves Guild N/A N/A
Well 150 0 Stables N/A N/A
2100 1525
Total 3625 Total minus the Necromancers Throne 2925

Building Rice Water Prerequisite 1 Prerequisite 2 Prerequisite 3
Peasant Hut 50 0 N/A N/A N/A
Forge 100 100 Peasant Hut N/A N/A
Blade Garden 50 150 Peasant Hut N/A N/A
Training Yard 150 50 Peasant Hut N/A N/A
Stables 150 150 Crypt of the Br N/A N/A
Crypt of the Br 250 50 Forge Blade Garden Training Yard
Warlocks Tower 600 200 Town Square Crypt of the Br N/A
Tower 100 0 Peasant Hut Town Square Keep
Aviary 150 150 Crypt of the Br N/A N/A
Town Square 200 300 Forge Blade Garden Training Yard
Keep 700 300 Town Square N/A N/A
Well 200 0 Town Square N/A N/A
2700 1450
Total 4150

Building Rice Water Prerequisite 1 Prerequisite 2 Prerequisite 3
Peasant Hut 50 0 N/A N/A N/A
Dojo 150 50 Peasant Hut N/A N/A
Target Range 175 75 Peasant Hut N/A N/A
Alchemist Hut 100 100 Peasant Hut N/A N/A
Stables 150 150 Peasant Hut N/A N/A
Shrine 150 75 Dojo N/A N/A
Fireworks Fact 150 100 Alchemist Hut N/A N/A
Dragon's Monum 600 200 Keep N/A N/A
Tower 100 0 Peasant Hut Town Square Keep
Bathhouse 100 200 Peasant Hut N/A N/A
Town Square 200 300 Bathhouse N/A N/A
Keep 650 550 Town Square Target Range N/A
Well 200 0 Town Square N/A N/A
2775 1800
Total 4575
Total - Dragon's Monument 3775

7. Which Clan has the highest building production cost.
Well Dragon of course.

8. Which Clan has the most Battle Gears.
Serpent 16 Distinct Battle Gears.
Dragon 16 Distinct Battle Gears.
Lotus 15 Distinct Battle Gears.
Wolf 10 Distinct Battle Gears.

Phew!