There's really no reason to play RBY when you have this (except for getting exclusives). Crystal is such a packed game, especially for its time, despite how crazy the pacing is. Definitely the best of the GB/C Pokemon selection, boasting a really streamlined visual experience. Prepare to devote at least 100 hours to just beating this game normally, both of my normal playthroughs have taken that long. Compared to gens 3-5 it leaves a lot to be desired and requires a lot of patience, which is why I wouldn't put it up against most newer entries. It is pretty cool for what it is, though.
251/251 Pokemon Caught
16/16 Gym Badges
350+ Hours