1) SNES v Genesis - Two great libraries, fairly close in specs, SNES had Nintendo first party, but Genesis had EA Sports.
2) Atari 5200 v Colecovision - Two great libraries, fairly close in specs, 5200 had Atari first party (which was good back then), ColecoVision has a larger library with overlooked classics.
3) Gameboy v Game Gear - GG killed on specs, but Nintendo name led the masses to drink their Kool-Aide instead.
4) PS2 v Dreamcast - Sony's hype got everyone to discount great Sega entry.
5) PSX v N64
6) PSX v Saturn - Horrible Sega launch led to disappointment even amoung fans.
7) PS2 v Xbox (tie) PS2 v Gamecube - The PS2 was such the 500 lb gorrilla that fighting over which was best was pointless.
9) Gamecube v Xbox - Two groups of fans couldn't be more different.
10) DS v PSP - Little overlap in target demographics, and the functional differences between the systems seems to be keeping the fanbois at home.
11) Atari 2600 v Intellivision (tie) NES v SMS (tie) Gameboy v Lynx - The other platform was a no-show. Although really, the match-up should be 2600 v Odyssey2 and Intellivision vs ColecoVision/5200, neither of which would crack the top 10.
n/a) X360 v PS3 - So early, it's all based on hype. So basicly, everyone's full of shit.