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;
NINTENDO Color-TV Game 15
PHILIPS Videopac G7000 (which is the MAGNAVOX Odyssey2 elsewhere)
SEGA Mega Drive (Genesis elsewhere, but I doubt you don't already know that )
NINTENDO Gameboy Color
NINTENDO Gameboy Advance
SONY PlayStation 3
SONY PlayStation 4
PC (Windows), Mac OS (I barely game on this, especially not my newer Macs, use PC for that), iPhone (I don't game on this), iPad (I incidentally game on this)
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.
Add a new PS4 to that.
As a side-note, I still want an original XBox. My cousin had one for a while and there were plenty of cool games.