The PS3 was the first non-Nintendo videogame system I ever bought, and I got a used old one because it had PS2 backwards compatability, Blu-Ray, and--as I understood it--most of the 360's games with a lower failure rate (However, I've heard Microsoft did something about the RRoD issue. Was it a hardware thing or just that warranty extension or what?)
To put it a different way...
Why Assorted Pro-360 Arguments are Irrelevant to Me
"It has better online": Well, that's what I've heard, but I don't live where I have constant access to non-dialup internet. Also, assuming I wasn't playing with friends (and maybe even then; and I think that would be more trouble than it was worth to choreograph that), I don't think I'd particularly enjoy playing online--assuming I even had time. Now, with PC games... maybe, but I haven't got any of those and I'm not sure I'll start.
"It's less blurry": Honestly, I looked at one of those comparison shots, and yes, the PS3 one's blurry, but I think I actually prefer it--at least in a still screengrab--over the jaggedness of the 360 one. I like the concept of being able to choose either look, though; I recall you could do that in Pikmin and SSBB.
"It has better exclusives": In what I assume is an understandable move, I don't necessarily seek out what good games there are on systems I don't own. From what I know of the 360, though, it seems that it and the PS3 share most games, with the 360's "exclusives" (a concept I've heard may die in the future, since it doesn't always make a whole lot of monetary sense for the developer) either eventually moving to the PS3 (or already on the PC, which I also obviously have, though I prefer console gaming) or being of a genre I'm not all that fond of.