I mentioned Robocod and Zool 2 earlier for the Amiga platformers, but to be honest nothing compared to my Mega Drive for a full platform game experience. The pad and system were just geared right for this genre, however the Amiga excelled in many other areas.
Sonic, and in particular Sonic 2 was unbeatable as a platformer for me. I only got a partial experience on the Amiga through Superfrog, Zool et al. Even when I used a MegaDrive controller, it just wasn't quite the same.