As for the poll, my head is telling me the SNES, but my heart and memories side with the N64. I had some of the best multiplayer experiences on that system, and it had some gems that never got recognition. I voted for that lol But realistically, I think that honor would go to the PS2 and SNES.
Anyway ... As much as I loved my Dreamcast it didn't live long enough to be a true great, but it had a lot of great and under appreciated titles.
I loved the Gamecube thought it was a master system. I probably played it more than my PS2 due to Smash Bros. Melee. and 007 Agent Under Fire. The MP was boss!
I owned an Xbox too.