Xbox. Best graphics, best online stuff, simple controller, harddrive, DVD playablility, CD playability, Halo, Halo 2, Half-Life 2
PS2 - Good graphics, good online stuff, complicated controller, DVD playability which makes it slow, no CD playability, San Andreas (for now), Ratchet & Clank
GC - Pretty good graphics, no online option, simple controller, no DVD or CD playability, portable, unique & original, Super Mario Bros., Metroid, Legend of Zelda
N64 - 64-bit graphics, no online option, simple controller, no DVD or CD playability, unique & original, Super Mario Bros., Metroid, Legend of Zelda
DS - 64-bit graphics, d-pad, SNES button configuration, no control stick, handheld, wireless, portable, very unique and very original, Super Mario Bros., Metroid, Legend of Zelda
Sega - Sonic
GB - Sucky graphics, d-pad, no control stick, handheld, wireless, portable, unique and original, Super Mario Bros., Metroid, Legend of Zelda
PC - Great graphics