By far the BEST system EVER was the Commodore AMIGA !!.. it had all the same style games that the Megadrive had, but also had Adventure Games, RPG’s, and was also a brilliant computer that made Windows look like a Toy!.
Plus it had Brilliant Graphics!!.. and it was released 6 to 7 years before the SNES or Megadrive.
Alot of Amiga games were also ported to the Megadrive and the SNES if they were a success on the Amiga.
Here are some screenshots, so you can see what kind of games and graphics the Amiga could produce. This is truly where 16 bit gaming started! A friend of mine used to ditch his Megadrive, just to come over and play on my Amiga. 
Lionheart
Making sure you're not a bot!
Elfmania
Making sure you're not a bot!
The First Samurai
Making sure you're not a bot!
Shadow Of The Beast
Making sure you're not a bot!
Cruise For A Corpse
Making sure you're not a bot!
Populous 2
Making sure you're not a bot!
SWIV
Making sure you're not a bot!
Turrican
Making sure you're not a bot!
Turrican 2
Making sure you're not a bot!
Unreal
Making sure you're not a bot!
Deliverance
Making sure you're not a bot!
UFO Enemy Unknown
Making sure you're not a bot!
Perihelion
Making sure you're not a bot!
Gods
Making sure you're not a bot!
( other versions were crap, originally released for Amiga )
Speedball 2
Making sure you're not a bot!
Xenon 2
Making sure you're not a bot!
Capital Punishment
Making sure you're not a bot!
And the list of games goes on and on and on!.
Sorry to list so many!. 