my 2 favorites are TDM and HQ.
First, the TDM. TDM is just awesome if you have like 10-15 people on each team. it gets crazy, but not as crazy as FFA. plus, you have teams to cover you(unless you team is very noob and get killed by rushers,which, BTW, rushers are COOL. im a pro rusher ;P)
As for HQ, this is a reall blast!!! you have to defend the HQ, therefore, more like real life. like, a base! and then some people try to destory that base, but you have to stop them. plus, it isn't like Domination because on Domination, you have 3 places to defend, where for HQ, you only have one place to defend. this will result in more excitement because it will be the whole team trying to destory the HQ. it'll be more tactical, one team defending, one team tring to destory.