[Just adding this, for the KoCs, the Soul Master/Dawn Warrior uses light while the Striker/Thunder Breaker uses lightning.]
I prefer Adventurers, kind of because I like how, if I DO get really into the character I'll have more potential than any KoC with 80 more levels to go. Also, I like the Ellin Forest PQ (for the most part) and it kind of sucks that they're shut out of it. But it's good at the same time.
The only KoC I really like is the Striker/Thunder Breaker.