I've had my PS3 for just over a year now. It is definitely my favorite next gen system, and I've owned a 360 since it's launch.
It just feels like such a complete machine to me. It's quiet, which is very important to me considering how much I hate the noise the 360 generates when spinning a disc. It's got every ounce of multimedia funtionality I could possibly want. I can pop any memory card right into the front of the thing and they just work. I can replace the hard drive any time I want, to almost any size I want. Anyway, you get the gist of it. These are all things I just can't do with my 360.
In terms of games I also think it's got the best exclusives. Give me Uncharted, MGS4, Ratchet and Clank, GT Prologue, Hot Shots Golf, and Motorstorm over the 360's exclusives any day of the week.
While I fully acknowledge the 360's superiority in the multiplatform games (GPU), it's no longer by wide margins anymore, and instead is usually just a small touch here or there that is better on the 360. Of course there are also some multiplatform games that are better on the PS3, and Burnout Paradise is one of my favorite games of this gen so far.
So yeah, I honestly love my PS3, and I can only see that growing stronger over time. With the improvements like in game XMB that are just around the corner, and the improvements I expect to see before the end of the year via firmware updates, I may not even own a 360 at some point.