My turn
Will write more once I'm back home, but here are the choices:
1. Unirally SNES - a very fun and unique racing / trick game on the SNES by the people who made Lemmings. Loads of fun and a very funky rolling title screen
2. Tiger Heli NES - a vertical arcade helicopter shoot-em-up. This game has huge sentimental value for me as I got it for Christmas together with the NES Turtles pack back in 1990 or so! My first ever shooter, and a lot of fun!
3. Mickey's Magical Quest SNES - a beautiful Capcom SNES platform with amazing graphics, memorable tunes, and lots of costumes for Mickey to try on
I think it's better than the Megadrive's Castle of Illusion.