Hhm tough choice between Sega and Nintendo. Had both NES and Megadrive, and played SNES & Genesis with friends.
I'm going to say Nintendo.
Currently playing: Ratchet & Clank Future: Tools of Destruction (PS3), Comet Crash (PS3), Super Stardust HD (PS3), League of Legends BETA (PC), Heroes of Newerth BETA (PC)
Finished recently: Uncharted: Drake's Fortune (PS3)