What do you think will be better online game Battle Field Bad Company 2 (BC2) Or Modern warfare 2 (MW2)?

I think MW2 is a bad *** game don't get me wrong but lately ive been turned away from it. it just dos'nt feel the same with all this cheating. first it was the javelin glitch than the care package and all these fake Prestige tens. so i stop playing it for a little while then i started to play BC2 demo and thought it was pretty good. its definitely different and a change but i had some a blast. also completely dominated but that's a different story. well my old copy of MW2 broke and i sorta want to play it so im thinking about buying it again and i only got enough for one game. im just worried that if i buy BC2 that it wont live up to what i expected because i had high hopes based off a demo. so what do you guys think i should do MW2 or BC2???