The type that is open world, or at least not linear like final fantasy 13 where you just push one button forward the whole game.
Also it needs to be a game, I don't like the type of rpg that you just listening and watching cutscenes, for example, witcher 3 was horrible due to this, you barely needed the controller at all.
I also need variation, I hated final fantasy 15 due to this, because I could use the same thing on every battle and win easily until the end of the game, didn't require any thinking or strategy at all.
Examples of great RPGs would be the Xenoblades series, its open world, its challenging, its mostly gaming with minimal cutscenes, its huge open worlds, and theres a lot of stuff to learn to battle and survive, cant think of any other good RPGs to be honest. I love the Mass effect (a bit too linear), Fallout and Elder scrolls series but those are too easy for me.
I also don't enjoy the types like Dark souls where you have to memorize the locations of the enemies and stuff, its unfair, I prefer a game based on skill rather than memory.
The absolute worst RPG I ever played I think was final fantasy 13, which is a shame because I loved the story and characters.
My favourite ever is Xenoblades X on the wiiU