well as i'm NOT in a racing clan, or trying to be in one... i guess an opinion that isnt biast off the scale is in order..
because, it generally depends as to what sort of player you are, if you're a frantic, run around shooting everything, then Slayer would be good for you, if you're a person who likes stratagy and teamwork, CTF or King of the Hill would be your strong suit, and if you want to halo team oddball, or regular oddball, it really depends as to how crazy the game can get, because 16 man FFA oddball on chillout is crazily fun, at times.
But i guess my vote goes to CTF, because mainly, it's rule free mostly, means you have one goal: Get the enemy flag to your base as many times as possible to win. this may seem primative but with certain aspects of the game tweaked a bit, along with the physics then it can be extremely fun alot of the time.
INferno.