I like them both, gives more of a challenge trying to blow the tanks/copters up, but you also get tired of being sniped when there are no tanks/copteres needless to say, i get sniped in the copter to so hm... lol
I didn't really enjoy vehicle maps much until Antispawn and I mowed down BobWango and a few others in the chopper, racking up around a 15+ kill streak. Had the laugh of a lifetime during that game.