what kind of games do u like?
fps is still slightly better on 360, although u can easily fps overdose on either.
action is hands down ps3.
adventure is also ps3.
platformers again ps3.
sports have higher quality on 360 but should even out over time, but also remember that sony has their own sports games (mlb the show owns mlb 2k, not sure about the rest)
wrpg is 360 hands down
jrpg is pathetic on both as of now and is the most interesting. mistwalker is 360 for now, likely to go multi in the future but no one knows how long ms will keep buying their exclusivity. sony has some second party rpg companies starting to shift over. some bigger companies are making a few 360 or multi rpg's, but those are very rare. it sounds like some companies are going to start developing or have for the ps3 since the 360 is bombing there, but its unconfirmed yet. square enix is also not a 360 backer, so nothing it has is likely to be 360 exclusive.
casual is sony for now. sony develops many casual games which help them, but the high price hurts this market. sony is taking a very hands on approach with casual download games which should give them the advantage. xbox live gets 360 casual games, but its not even close to the level of sony. most third party casual is xbla or multi.
fighting is a toss up leaning to sony. 360 might have doa 4 and vf5 online (which will likely be terrible) but i believe having tekken 6 is bigger for sony.
racing another toss up leaning to sony. gt5, formula 1, and motorstorm beat out pgr4 and forza 2.
i personally believe that sony will have a better future, but it depends on preference. either console will be great, so dont regret your choice either way.