Had both as a fortunate 11yr old, thoroughly enjoyed both at the time. Was lucky enough to have almost all the games too.
I've always thought the whole this vs that debate was silly. I prefer to play games, not systems.
But for me the snes was and is the better experience, so much so that i still own and play the snes games via vc on my wii.
Megadeive was a great machine too, but it isn't altered beast i fondly remember, it is mario world and zelda lttp. Secret of mana, f zero! Actraiser and cybernator.
In fact it is safe to say, if i could buy a new snes today i'd pay £100 for the privilige of owning the lovely hardware.