I agree, it's worth trying out!
PS was amazing, I didn't play it as a kid but I'm glad I didn't miss out on it and Ys 1 (the first US localization of the Ys series) is a killer I regret soo much not getting my hands on it when I was growing up. There's also Psychic World and Ultima IV, their SMS versions were superb.
The SMS was in many ways better than the NES, but due to Nintendo's policy to lock out 3rd party games from the NES unless they were exclusive for 2 years the SMS was deprived of a lot of 3rd party software and that impacted sales considerably. On the flip side we got ton's of unique software for the system, even after dry sales Sega never stopped supporting it until it ended it's lifecycle. There wasn't a drought of games but there were a lot of arcade ports, the good thing is we had a bunch of unique console spinofs from those ports and most of the ports were completely redesigned as console games rather that operating like coin-op. (Shinobi comes to mind, you had a lifebar and set number of lives you could increment meanwhile in the arcade ver you died from a single hit. The gameplay was also a bit more dynamic, on the console version you weren't forced to save everyone in a level and you could move around the map more freely).
I believe the console caught on on PR because the arcades here at the time were filled with Sega games, naturally people turned to the SMS though I'm uncertain how well it actually performed vs the NES here. I don't recall hardly any NESs but tons of SMS.(First time I saw an NES was during the Genesis era 0-0, I had vaguely heard of it, mostly as the console that Mario was on)
EDIT - Oh and I forgot in my original post Snail Maze, the slew of Alex the Kid games and Golden Axe Warrior. We really loved those ^_^