Seiken Densetsu 3
As good as Secret of Mana. Expect a similar lengthy adventure with a good level of variety. With that said, I still prefer Secret of Mana and find it much more memorable, but I can't tell why. Perhaps if we had the chance to play SD3 back in the day, we would have appreciated it more.
+ The general style of the game may seem different, but the gameplay is almost intact
+ AI characters no longer cause you to get stuck. They can wander off the screen
+ Some of the soundtracks were catchy
+ Great variety of locations and monsters. Some of the villages were memorable and unique.
+ Some of the boss fights were simply awesome
+ The multiple scenarios were well-done from technical aspects. You could tell they have put a lot of efforts on this part of the game. I imagine this would greatly raise the game's replayablity.
- I can't help but wish the multiple scenario's concept was dropped on favour of a more consistant and organized story. It felt a bit messy and disjointed the way it is.
- Lack of optional side quests
- The menus were unresponsive and clunky. I wonder if it has something to do with the translation. Luckily, you won't be using them much.
I'm surprised you didn't mention anything about the class changing trees. SD3 was one of the first console RPG's to have the ability to choose the Light or Dark path for class changing. Giving you a wide variety of spells, moves, and replay-ability with changes to the sprite artwork and character portraits.
The combat in SD3 is pretty close to that of SoM, but I felt SoM had a better "attack cool-down" system by showing the attack energy percentage rather than just a character animation to indicate when you're ready for another full attack. Also, the charging system (by holding down the attack button) in SoM is superior than the "accumulated successful attacks" for allowing the Special physical attacks. But this is all personal preference.
SD3's group set-up is nice at the beginning of the game, having multiple class choices of who would make up your group. Much nicer in terms of RPG-ness than SoM. Story-wise I like the multiple endings, as well as the tie-ins between multiple characters.
Artwise, SD3 is probably the best looking game on the Super Fami, and it's definitely better looking than SoM. There are multiple parts of the game where I caught myself thinking "man, this is one gorgeous sprite game". The backgrounds are lush and vibrant, the bosses are epic and colourful, and the spells and special attacks are all animated handsomely and are very iconic.
I'm not sure if SD3 is the best RPG on the Super Fami, but it's definitely in my top 3.