Just as I finished making my previous post, Dr. Mario immediately popped into mind, so that's definitely another example, for sure.
Games that were released around the same time for both systems I didn't count, Wario's Woods, being one such example. Though looking up Tetris 2, it looks like the SNES version came out about a year later, so I would count that as an upgrade since the visual style is completely different.
The great thing about Dragon Quest is that is helped simplify RPGs overall. Games like Wizardry were hellishly brutal, judging from the game diaries I've read of the first few titles. The Ultima series I find a bit more forgiving, though compared to Japanese RPGs, is still quite intricate and complicated, such as its system of casting magic.
I tend to prefer Japanese RPGs because of their simplicity. I'm not much of a fan of creating my own characters, which is much more commonly found in Western RPGs. Distributing points in statistics is not my idea of fun. I find it a troublesome obstacle if I just want to see what a certain game is like if I'm new to it. I simply want to start a game and have the story begin unfolding right away. And because I am learning Japanese and play a lot of JRPGs for that very purpose, I don't want to be bogged down in minutiae; I want to concentrate on what the characters are saying. I think this is probably the big reason why all I ever play these days are RPGs for the SNES, Playstation, and other early consoles. It certainly doesn't hurt finding them on eBay for $10 or less per game.