Trophies because I have a PS3 and not an X360.
Platinums are also a good incentive for me. Like if I had Achievements, 1000G/1000G would mean nothing other than I have 1000pts. But if I platinum a game, it give's me a a special Platinum trophy so I personally find that a good thing.
But of course Achievements are better than Trophies for one particular thing... Syncing.








