So this thread got me thinking about my multiplatform games and thinking why I got each game for each system. 

So I'm curious for you people who had to choose what platform to get a game, why did you choose the platform you chose?  Note that I'm not interested if you only have X system and that's why you bought the game for that system.

For me:

• Dragon Age: Origins (PC) - I wanted the editor and it's not good on consoles
• Left 4 Dead 1/2 (PC) - I wanted the editor and played often at work with coworkers
• The Orange Box (PC) - best version and cheaper
• The Elder Scrolls IV: Oblivion (PC) - best version
• Unreal Tournament III (PC) - best version and I wanted the editor
• Red Dead Redemption (360) - friends on XBL
• Super Street Fighter IV (360) - friends on XBL, D-Pad equally bad on both, I could get a snazzy controller for the 360 easier
• Bioshock 2 (360) - achievements
• Bayonetta (360) - best version
• Borderlands (360) - friends on XBL
• Left 4 Dead 1/2 (360) - friends on XBL
• Call of Duty: Modern Warefare 1/2 (360) - achievements, friends on XBL
• NCAA games (360) - achievements
• Madden games (360) - achievements
• Red Faction: Guerrilla (360) - better version
• Bioshock (360) - only version at the time
• The Orange Box (360) - achievements, better console version
• Gears of War (360) - PC couldn't run it well, prefer controller/couch
• Mass Effect 1/2 (360) - PC couldn't run it well, prefer controller/couch
• Saint's Row 2 (360) - Achievements
• The Elder Scrolls IV - Game of the Year Edition (360) - Achievements
• Eternal Sonata (360) - only version at the time
• The Force Unleashed (360) - achievements
• Fallout 3 (360) - Achievements
• Blur (PS3) - only version I could find
• Final Fantasy XIII (PS3) - best version
• Batman: Arkham Asylum (PS3) - free DLC
• Dead Space (PS3) - wanted a game with trophies

Note when I say achievements, I mean I prefer achievements over trophies.  Simply a personal preference.

PS3 for Sony Exclusives and 360 for Everything Else

All multi on PS3 because I prefer the controller and have more friends on it, im actually not connected to Xbox live. But from now on, multi will be on PC, ive just built a great gaming PC and im getting a 3D projector with 3D vision as soon as I sell my current projector : ).

Mass Effect&Mass Effect 2 (PC) - Best versions                                                                                                                                  

Dragon Age Origins (PC) - Best version                                                                                                                                                   

Call of Duty games (PC) - Best versions                                                                                                                                                     

Metro 2033 (PC) - Best version                                                                                                                                                                     

The Darkness (X360) - found it cheap (2€.. =D)                                                                                                                                        

Left 4 Dead 2 (PC) - Got it cheap from Steam (10€..) and it is best version                                                                              

Prince of Persia (PS3) - Found it cheap (15€)                                                                                                                                             

Final Fantasy XIII (PS3) - Best version                                                                                                                                                 

Assanssin's Creed 2 (X360) - best version at the time I bought the game (PC version was released months later)                

Fallout 3 (PC) - Best version                                                                                                                                                                    

Oblivion (PC) - Best version                                                                                                                                                                      

Far Cry 2 (PC) - Best version                                                                                                                                                                           

Star Ocean IV: The Last Hope (PS3) - Japanese VA so best version                                                                                              

The Orange Box (PC) - Best version                                                                                                                                                        

NHL 10 (X360) - friends on XBL                                                                                                                                                              

Red Dead Redemption (X360) - Best version

So usually I pick PC version if it is available.

ur are game developer and ur pc doesnt run mass effect and gears of war pc well? /facepalm

I admittedly don't get many multiplatform games but most of them I get on Wii.  Only when the 360 version is the only option(I don't own a gaming PC or PS3) or the Wii version is.. garbage do I get a multiplatform title on the X that is box.

Xbox360 for any Xbox exclusives that catch my eye and for any multi-platform games.  The Achievements make for a good motivator for multi-platform titles, but also, the Xbox360 controller is the most comfortable of this generation.

I have a Wii just, basically, for Nintendo games and any good exclusive titles. 

I don't have a PS3, but when I do get one--it'll largely just be for the exclusives therein.

I got a PSP and a DS to have them, and for their unique titles.

I got FF13 and Batman AA for the PS3 because it had the decidedly better version.  I got Dead Space for the PS3, too because it was incredibly cheap and only the PS3 version was available. I prefer the 360 overall.  I just like the online, update speed, controller, and the ability to install any title (for improved performance).  Besides that, even though I'm not a big Achievement whore, I love getting Achievements but I'm not a big fan of Trophies.  I never felt compelled to play anything for a PC.  It just feels.......wrong.

X360 for everything, but I would chose PC for Halo Wars given the option (only if it had deeper gameplay) (I'd still buy console version as well though!)

PS3 for all multiplats because I have 4 PS3 controls and only 1 360 controller. Plus everyone I play games with is more identifiable with Playstaion than they are with Xbox, so I guess they feel more comfortable with the console. The 360 is my exclusive machine.