What are each of the weapon kits effective on? Also, a little something I discovered: sometimes i randomly get massive stacks of rusty coins, like 19000 or something, and when i sell them at the freelancers guild i get ridiculous amounts of goods, like twenty iron scimitars or something. Whats with that?
Well, it's probably not totally random ^^
My best guess is you sold a huge stack of something at the caravanserai that turns into silver coins, like a whole forgotten beast or giant sperm whales sized stack of meat, and then did "exchange silver coins to orc shillings". They happened to grab the big stack, and you got a big pile of shillings. This can happen, the transactions respect the stack size in general. 19000 shillings should be only like five or six scimitars
Jaguar kit is just generally excellent for melee. Macuahuitl is good for cutting things in half, claws are good for stopping enemy in its tracks with pain... Jaguar kit has both. Also an Uruk can wield with a shield so no downside. This is excellent for humanoid or a little bigger enemies, that feel pain.
Dragon kit is composite bow plus katana, it's like the second best bow plus a weapon that is more than sufficient to meet any enemy in melee. Or better yet, to coup de grace an enemy already riddled with arrows. Plus Uruk can use shield. This is probably the most flexible society kit in terms of being good in every situation. If you factor in enchanted arrows then it's really deadly.
Seawolf kit, also a good balance of melee and range, but pistol instead of bow. Bullets are better for piercing armor and skulls, but less good than (broadhead) orcish arrows at causing catastrophic bleeding/severing damage. Any Orc can use with a shield.
Falcon kit has a spear, so it's great against big or heavily armored enemies, and the bola are a very effective pain/disabling rather than a killing weapon. Bola and spears are both easy to craft so this is a good one you can get sort of earlier in the fort. Any Orc can use with a shield.
Assassin's kit is the best at range; it's like a greatbow. The melee attacks are like a dagger, so that is not great. Big enough that it's Multigrasp. This is the one for your dedicated archers.
Lifeguard kit is like a musket; plus an armor crushing polehammer. If you have a source of musket balls then this is probably the best offensive weapon. Only shortcoming that it's multigrasp so no shield, and musket balls can be tough to come by early in the game. This is the one for your dedicated gunners, and you don't have to fear them getting stuck in melee sometimes, so they can accompany your melee squads out into battle.
Berzerker and Blademaster are both 2H kits, and have the biggest critical strikes, you'll be getting one-shot kills against even larger-than-humanoid enemies. But you need good weapon and dodge skills to make up for the lack of shield.