Ok, pretty much no-one in this thread is right.
7th gen (Wii gen)
Current winners Wii, DS
Current losers Tie between Vii, Gizmodo, and a few other systems, all of which are on buggerall sales
6th gen
Winners PS2, GBA
Losers Tapwave Zodiac is the handheld with the lowest tracked sales. As for consoles, GC > DC > a bunch of other systems
5th Gen
Winners PS1, GB
Losers Apple Pippin
4th gen
Winner Snes
Loser CDi
3rd gen
Winner - Nes
Loser - Atari 7800
2nd gen
Winners - Atari 2600, game and Watch
Losers Various not worth mentioning
1st gen
Winner unknown
loser - unknown
Count (win/loss)
nintendo (7/0)
Sony (2/0)
Microsoft (0/0)