Heh - My decision between the PS2 vs. the X-Box basically came down to fate/a flip-of-the-coin
I'll admit to having a pretty 'unusual' gaming-history...
When I was 7-8 years old - I spent A LOT of time down the shore in a time & place where arcades were very popular & populated...I was quickly hooked-on the likes of Dragon's Lair, Zaxxon, Galaga (*Always* had my initials next to the top score), Donkey Kong, Robotron, Tempest, Joust, Dig-Dug, air-hockey, and; hell - even Pinball. Then...
...I started playing on Ataris (C-380 & 2600) when they came out.
I had an Apple ][E for stuff like Ultima.
I kept-up with/stayed current & connected to gaming on/during the Commodore 64, Intellivision, Colecovision, and then, in my early teens, the NES (Mario Bros. & Zelda) came out & I played those.
Nothing unusual, so far...right?
Well...this is where it diverges from most of the friends/other gamers that I used to game with...
They liked (and kept-up w/ gaming) - I liked (and kept-up with) the "wrong crowd", skipping school, getting high, growing my hair 1/2 way down my back, getting/learning how to play a guitar...and everything, good & bad, associated with having long hair, playing a guitar, joining a band, chasing (and, once in a blue moon - getting chased *BY*) girls who were into such things...
TL;DR - Let's say that I got..."detoured"/"distracted" from gaming until right around the time that the PS2 & X-Box were young.
By the time I was interested in buying one, I was so far gone & out-of-touch w/ gaming...that I didn't even know what the differences were between Sony & MS' consoles.
At the time I was ready to buy, it was in December (no stores had either one in stock *or* any idea when they might be getting more in); so, it all came down to me buying whichever became available 1st...turned-out to be the PS2.
I currently own a PS2, (2) PS3's (one's b/c with PS2 games the other's a Slim), a PSP 3000, a Game-Cube, a DS-i-XL, a 3-DS-XL, and a Game-Boy Color...I've also owned an X-Box & a 360.
All things being equal, I've come to find that I prefer Sony's consoles & controllers.
If/When everything is equal...Sony will still always be my 1st choice.
The "FAT" PS3 was the 1st/only console that I've bought at launch for full price, so far.
Next Gen...Sony's
"got a lot of s'plaining & convincing" to do if they value & want to keep *This* customer!
However, not being a fanboy/feeling like I "owe" any loyalty to any company or corporation...despite my preference in Sony's products...when it came down to choosing between getting a 3-DS vs. a Vita first (I'll eventually get the other one, too) - I had to go w/ the 3-DS...well...the 3-DS-XL; actually - since I was lucky enough to not be an early-adopter -which is very good- because - had I bought a launch 3-DS at launch 3-DS prices...only to have Nintendo release a "bigger & better" version so quickly...I would *NOT* have been a happy customer
Really, what won me over to the 3-DS-XL was:
Devil Survivor: Overclocked,
SMT: Soul-Hackers, and Etrian Odyssey 4 (I was very confident that we'd be getting these when I bought it) *Compared* to Vita's (IMO) lack of any "must-have" RPG's out or announced & confirmed.