I’ll start by saying I owned a 360, and moved on to a PS3, for reasons I’ll list at the bottom.
**I would like to know about how reliable online gaming is on both consoles.
**
The 360 has a much better online experience, which NOUNE will, I’m sure, go into detail about.  However, it’s free on the PS3, versus ~$40 on the 360.
**If both are wireless capable.
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Capable?  Yes.  Out of the box?  No.  Only the PS3 has built-in WiFi.  It’ll cost you $50-80 (depending on your willingness to experiment with modding a router) for a 360.
I don’t need to know about exclusives games for the system.
Really?  Exclusives are, in my opinion, a very important part of the equation that only you can decide on.
My main reasons for switching to a PS3:
Bluray.  This was huge for me.  I love movies, and I have a 47" screen to watch them on.  I can also take advantage of the full 7.1 HD soundtracks that only bluray offers (“only” meaning “let’s not talk about HDDVD”).
**Free online play. **I’m not a big online player.  But on the very rare occasion, I don’t mind a slightly inferior experience.  And I can’t tell the difference, because I was never willing to spend the money to go online with a 360.
**Media streaming. ** Yes, the 360 does a pretty good job.  But the PS3 is an absolute workhorse in this department.  And now the 360 can’t even boast about Netflix streaming, which PS3 just got last week.
Did I mention bluray?  It’s amazing.
Some other differences:
Controller.  I will admit that I miss the 360 controller.  It has a little more heft to it, and fits my hands better.  Sony is clearly focused on an asian market when they design their hardware peripherals.
**
XBLE v. PSN.**  Not just online gaming.  Both have somewhat different games on sale as well.  It’s also kind of a toss-up, but I’d casually say that lately they’ve been doing a better job.  I think there was more free DLC for a recent game that Sony offered that MS didn’t.  Something to look into.