Is it exclusive content? Graphics? Controller? Friends? For me it always comes down to content, so for example I was debating on getting Asscreed 3 on the Ps3 or Wii U but once I realized the ps3 version is getting exclusive content on disc over every other version, that was the deciding factor. Also was the case with Batman:AA playable Joker content. (Well at least on consoles lol) :D
Controller is my main deciding factor. It's the reason most of my multi-plats are on PS3. That and the ease of jumping between games and Netflix. I bought RDR on 360 because of how much better the version is said to be even by people that have the PS3 version. I've bought a few multi-plats on 360 because the used copy was so much cheaper than the PS3 version I'd spend double or more going PS3. Some for Steam, well... Steam sales, duh.
I find television very educating. Every time somebody turns on the set, I go into the other room and read a book. Groucho Marx
If I have friends who will play it with me, X-Box. If it's a single player game, friends aren't interested, or I just don't care about the multiplayer then PS3. Everynow and then I'll by a game I wasn't really sure about because it was just that darn cheap on Steam.
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Like, say, I got CoD4 for 360 because I tend to feel they have a better online "community" with Xbox Live and more of my friends are on Xbox Live. Yet, when I got Street Fighter 4, I chose the PS3 version, because the D-Pad on 360 controllers are possibly the worst things ever.
Say, for Resident Evil 4, Killer 7, Alien Hominid, Viewtiful Joe... etc... I picked up the Gamecube version over the PS2 versions, because the gamecube is a more powerful system and I don't need to worry about wearing out the system or frame rates chugging or whatever that might accompany the PS2. Yet, the c-stick was awful on the Gamecube, and PS2 game prices were generally lower, or online, and often they had special features that would lead me to get the game on THAT system.
Then you get to stuff like MegaMan Anniversary Collection, which was unplayable on the Gamecube due to swapped jump/shoot buttons, and sluggish on the PS2... so I ended up re-buying it or the Xbox, which was not only more powerful and had better special features, but had custom controls.
Also, if I start buying a "series" on one console, I tend to like continuing the series on the same console.
Owner of The NES, SNES, N64, GCN, Wii, SMS, GEN, TG16, PSX, PS2, PS3, XBOX, 360, GB, GBC, GBA SP, GB Micro, DS, DSLite, PSP and a lot of crappy games. --BLINGO!