Xbox 360, because I have had the most fun with it over any console.
Yes I owned a SNES, I can only remember one good game for it and that was Super Mario 3.
Yes I owned an N64, and that had a few great games - Mario Kart and Goldeneye come straight to mind.
Yes I owned a PS1 and PS2, and I tell you I spent many happy hours playing Crash Bandicoot and Spyro.
But the game console I have the most fond memories with is the 360, despite the fact it's noisy, and despite the fact it's fragile, and despite the fact they over heat, it's my favourite.
No one said it had to be an old console...