fave. system (besides GP32?) I'd have to say I have had the most fun during my formative years with the NES. sure the successors looked better, but at the time those games were real novel and just a blast to play.
favorite games - so hard to choose! Here's some:
Herzog Zwei (sega genesis) - favorite game of all time..
Blaster Master, Mega man, castlevania, contra series' - all the usual
SNES - super ghouls n ghosts, Super Aleste/Space Megaforce
Genesis - Eswat, Revenge of Shinobi (+ sequels), Thunderforce series, Musha
arcades: all the classics (qix, ms pacman, galaga, tapper, burgertime, klax)