Holy crap, you can do multiple option polls? What if the pulp/no-pulp poll had been like this? But I digress. I generally play on the PC, but it really depends on what game I'm into at the moment. Right now, it's Fire Emblem Awakening, so the 3DS has been getting a lot of play time.
PC, PS2, and DS.
Since I literally just bought Persona 3 on my brother's PS3, that's probably also going to get some use after I finish Nocturne. But since that's a PS2 game, you might also be able to count that under "PS2".
EDIT: I do still have a 360, but after getting a PC that thing's usage almost flatlined. If it weren't for Red Dead Redemption and Forza Horizon, that thing would be pretty much useless now.
My preferred gaming system is PS3, this is due to me liking it's controller and exclusives better, also free online is very nice.
I also have a strong addiction to my DS (damn you Chrono Trigger and Fire Emblem!) lol
But each person is different and has their own personal system preference, and that's cool with me.