Team based FPSs benefit the most of friend groups and "regulars" servers. It's the best way of finding real teamwork, playing in a higher skill level environment and, with adequate admins, it's the only real defense against cheating. However, establishing a server community and friend group takes some time, during which you play in a low teamwork, low skill and higher cheating possibility (as low as it may be) environment.
So, do you plan on trying to reunite your same friend group/server community from a previous game you're already playing? Which game's groups do you think will be easiest to move to Brink?
(I just hope to find one of the amazing tf2 communities I've been part of, as soon as possible after the game release)