battlefield 3 or 4

BFBC 2 and BF3 in this order ; BC2 is on sale now, pretty cheap...

Well, I say BF4 is great. Got it just over a week back and when I'm gaming, it's about all I'm doing lately. For the people saying it's buggy... I haven't had any problems playing it since I got it apart from getting randomly disconnected from a single server twice last night, but that could have been that server of course and can happen in any game.

BF 4 is better. It has tons of (little) improvements that you're really gonna miss if you start to play BF 3 again. (I can't even touch the 3rd one anymore because of this)

definitely bf4. more modes, better maps => more fun. the downside is the price, of course. and maybe the bugs. not sure how bad it really is right now. as far as i know, there has been a lot of bugfixing since release (yes, it was nearly unplayable at that time).

BF3 is cheap. And BF4 is almost same as BF3.