Good to see some PS3 love in this topic.
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Here are my thoughts on why the PS3 is the better choice this generation.
At the beginning of the generation, after having owned a PS1 and several PS2's, I gave a long, hard, honest look at the 360 versus the PS3 before making my decision.
The 360 initially promised to be very friendly to independent developers, a point which in-and-of-itself was nearly enough to convince me to make the leap. It later came to light that the 360's "Live Arcade" platform wasn't anywhere near as great as it sounded -- having to pay $99, being forced into developing the games in C# (while I'm more of a C++ and Java type of guy), and then releasing a game into a market that's very oversaturated, making it hard for buyers to find quality games among the heap of crap (or so seems to be the common opinion; I haven't browsed the market myself, but an interview from the developers of Breath of Death VII and Cthulu Saves the World comes to mind, in which the developers described this phenomenon and showed how their Steam PC release's sales immediately eclipsed their Live Arcade sales, attributing it to the poor organization and oversaturation of the Live Arcade market).
So there went my first major selling point for the 360. I then looked at the games...
To date, there are few 360 exclusives that I'd even buy. The only ones that come to mind are the HD remake of Perfect Dark (played it on a friend's 360), as well as Perfect Dark Zero (haven't played it). There could be a few more that I just haven't seen, but nothing else has stood out to me enough to remember it. I'm not a fan of FPS's, so I guess that throws out the majority of the 360's exclusive appeal. Compared to this, nearly half of the PS3 games I play are exclusives.
As others pointed out, optionally paying $50/year for PS+ and getting access to a handful of games, increasing in number as the subscription length endures, is preferable to being forced to pay somewhere around the same price just to play online at all. Granted, XBox Live has some nice voice chat features for those who never play online without their headsets (and the scarcity of communication in online PS3 games can be seen as a drawback), but PS+ still provides much more value than XBox Live.
Those are the reasons PS3 became, and remains, my console of choice this generation. I don't subscribe to fanboyism (perhaps evidenced by my scathing opinion of the Vita); whichever console offers the best product / best value is the one I'll purchase in any given generation. In my opinion, the 360 doesn't even come close to the value of the PS3.