PS3 - because it was at home and I was in Uni without a TV. I brought it with me in second year and life was better.
Wii - honestly, I loved it and I went through a phase where I played it almost exclusively (even neglecting PS3). Think I went from Mario Galaxy -> Mario Galaxy 2 -> Crystal Bearers -> Battalion Wars 2, while playing MKWii and ACWii a little bit the whole time. But then I kinda lost interest to PS3 again. I don't know how/why it happened, but I never got back to Wii to finish the backlog of stuff I was interested in. Still need to get around to finishing Xenoblade & The Last Story.







