Sorry for bothering but are these versions of Final Fantasy games recommended to play over their original versions?
Look for gameplay videos: FF3 and FF4 on Nintendo DS remakes are in 3d, the characters are somehow chibi, I found them beautiful and I enjoyed them (of the original version of early FF, I've only played FF1, but I prefer the graphics in ds games). It all comes to that (and MAYBE to some quality-of-life features?).
For recommended titles: if you go physical I believe many hidden gems won't be easy to find at cheap price, but here's my list.
*Suikoden Tierkreis (turn-based rpg with lots of characters to recruit)
*Okamiden (spin-off/sequel to Okami), drawing with the touch screen is awesome and even if on little screen they kept the great atmosphere of the original game
*Final Fantasy III and Final Fantasy IV as they already said, great turn-based rpg
*Hotel Dusk and Last Window, great adventure/point-and-click games, you hold the console vertically like a book
*Super Princess Peach, platformer with Peach having superpowers and being the star of the show
*Final Fantasy XII Revenant Wings, strategy in real time
*Another Code, if you haven't played the remake on Switch (which includes also the sequel) try this, after ending this game I felt no need for a sequel though, it's another point-and-click from same developers of Hotel Dusk