My brother convinced our parents to get us the PS2 when we were younger, and I'm glad he did. While my friends had the Xbox, I just didn't see the appeal of any of the Xbox-exclusive games. PS2 still stands as my favorite console.
When I moved out and into an apartment with two gamers, one owned the Wii and PS3 while the other owned the 360. I was surprised to find that I preferred the available games for the 360, so when they both moved out, I got a 360.
But now it seems like the games for the 360 have tapered off (and less friends are playing their 360s [usually due to the consoles breaking]) and the PS3 is still living (kinda) large and I'm missing out on titles like Journey.
Tempted to get a PS3 now, but I think I can wait until more news comes out about the next gen of systems...