I probably had the most fun on the original xbox. It's more or less due to my cicrumstances at the time though, I wasn't so busy so I played a HEAPS of games and didn't give a damn about anything else.
Games like Turtles in Time, Pilot Wings, STrike Gunner STG, Both Mario Worlds one & two, Super scope six, & of course Star Fox & many more.
Modern: Xbox because that's when I joined & helped create my first online clan, with the help of my bro aka Ice, me Fire, Titan, & a bad kitty, a red headed green eyed girl.