Alrighty then.
I don't know what you prefer, but I'll order them per Gen. I have all these still, never sold anything except a duplicate Dreamcast;
1st:
NINTENDO Color-TV Game 15
2nd:
ATARI 2600
PHILIPS Videopac G7000 (which is the MAGNAVOX Odyssey2 elsewhere)
3rd:
NINTENDO NES
4th:
NINTENDO SNES
NINTENDO Gameboy
SEGA Mega Drive (Genesis elsewhere, but I doubt you don't already know that 
)
5th:
NINTENDO N64
NINTENDO Gameboy Color
SONY PlayStation
6th:
NINTENDO GameCube
NINTENDO Gameboy Advance
SEGA Dreamcast
7th:
NINTENDO Wii
NINTENDO DS
SONY PlayStation 3
8th:
NINTENDO WiiU
NINTENDO 3DS
Others:
PC, Mac OS (though I barely game on that, use PC for that), iPhone, iPad
As for the poll, I don't really identify with any, because every type besides mobile (unless you count ports of 'real' games obviously) has a couple of my all-time favorites. If going by pure gametime however, PC wins hands-down, yet across all generations I own way more console games. Neither is really a fair comparison though.
