Those games were so much fun. I used to dream of playing them back when they had them on import lists in magazine ads. Finally when my friend and I found out about emulation back in 97 I finally got ahold of a rom for it and played it on ZSNES. The only DBZ game comparable to those is the one for PSX- Super Battle 22, or whatever it's called. I'll admit, I had some fun playing through Budokai Tenkaichi 3 on PS2, but nowhere near as great as the SNES and Genesis games. I always felt the Genesis games had the better graphics.
When I make lists I try to stray from the usual games that are basically shoo-ins. This is a tough list for me to make for that reason and because I'm constantly finding old gems that I never got to play when I was a kid.
I love Donkey Kong Country, I always have a lot of fun playing through it. I'm not sure exactly what it is about that game, but it's very enjoyable. I think if you play far enough into it, you'll probably find a level you like because there seems to be a little something for everyone in there. The controls feel kind of muddy to me sometimes, and that can definitely put a damper on your experience.
I played a lot more Sonic than Mario once I got a Sega, but Super Mario World is always king over all of those in my eyes. That game is just so massive and intricate. It's a masterpiece. And that star road stuff, the Gnarly, Tubular, etc... That was so awesome and fun to figure out! The only Sonic that compares to it is Sonic 3 with Sonic & Knuckles added on(the full-game playthrough). Even then, it's not as deep a game as SMW, at least in my eyes.