PS2 >>>>>> PS1 > GCN >>> N64 >> Xbox > Dreamcast
I've played nothing from the original Xbox other than Halo CE and Halo 2... and I don't intend to. Still more games than I've played from the DC - just Shenmue. OoT and MM are the only N64 games I care about, and they can only carry it so far. GCN has a decent selection of games I like - RE4, Metroid Prime, FE9, Skies of Arcadia, REmake, Twilight Princess and, to an extent, F-Zero GX and Wind Waker. PS1 has a similar selection in FFVII-FFIX, Tactics, Xenogears, Crash Bandicoot 1-3, the Oddworld games and MGS1. It's very close between them. PS2 is in a tier of its own.
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Who knew the Rivalry Rumble would be so predictable? SuperNiceDog, that's who.