As a poor student, I can't afford to buy any consoles.... So I'm a PC girl atm... I do use Steam, and I think it's a great system, but I prefer to have my games on my desktop. There's a few games I'd rather play on Xbox, or that are only available on Xbox (as far as I know, though that may be a local thing), so I'm pretty sure I'll end up buying one as soon as I can afford it... Right now rent and food are more important, though :)
I play my 360 the most. I like earning achievements and also the controller is better then the PlayStation in my opinion. When a good single player game comes out on PS3 like Uncharted I will play that.
I play on pretty much both Ps3 and Xbox 360, but i have certain games for certain systems... Like on the 360 I play games like Halo, Borderlands, and Madden. And on the Ps3 I mainly play Skyrim and inFamous, :)
I used to be all about PC gaming. But once XBOX Live got good and my friends moved away Xbox gaming has become my preferred method. It started as just for online but as I played more and more games using the Xbox just became natural.
I just recently got rid of my consoles for money cause I was having financial problems. Turns out I really didn't miss it. I have been playing on the PC for years and I take the Mac everywhere with me so I just play League of Legends and WoW most of the time. My PC is super nice and I always upgrade it so I stopped worrying about it. haha... But I would love to have another Xbox just to have it!
I favor PC games and PC gaming, but I haven't the money for a proper rig to play the super cool good games. I have an Xbox for that reason, and I do enjoy it, but I haven't even turned it on for a few months, really.
I play my PS3 the most because it's my media hub (Blu-ray and all that) and I prefer the exclusive games on it. But it does have some issues that could be worked out like cross-chat, a better store, and less game updates.
I play mostly on my PC because: 1) I only have a Wii and a Playstation (1) for consoles 2)The Steam Achievement Notification makes me happy 3) I am too lazy to get an XBox 4) My mother accidently bought a really good gaming desktop computer, and never uses it for its intended purpose.