I have played too many to have a single fave, but Final Fantasy V, Dragon Quest XI and PMD (If those kinda games count as rpgs) sky are probably amongst my faves. Probably should give Disgaea 5 and Final Fantasy XIV (mmoRPG if those count) a mention too.
Worst is hard to answer cause I try to avoid bad games, though I do hate FF2's design a lot. The doors man, the doors.
@Mint I wasn't too fond of Pokémon Sun either. Everything felt so railroaded (and yes, the older games also had that, but it wasn't as bad), so the game lacks that feeling of freedom that other games had.
Worst is hard to answer cause I try to avoid bad games, though I do hate FF2's design a lot. The doors man, the doors.