Can I speak negatives about Microsoft? Because I don't like their general business practices. Not just all the recent backpeddling they've been doing either, but crap like putting Netflix behind a pay wall. I bought both a 360 and a PS3 last gen but in the end I spent more time using the PS3 because of PS+ and free online play.
But basically:
+ Sony seems to have learned from their mistakes (cross game chat, finally).
+ better hardware overall (if only slightly)
+ improved controller over DS3
+ streaming games online (I love streaming)
+ speaking of streaming, Gaikai/streaming live TV instead of using cable boxes
+ PS+ service is really good
+ most of the games I care about are multi-platform
+ the only "exclusive" Xbox games I want are also on PC
+ naughty dog
The only advantage that the Xbox has, to me, is dedicated servers. Mainly because I really really hate matchmaking (long time PC gamer). However, I do think that Sony will do something about this in the future.