I can't stand RPGMX/all the other ones. I have redownloaded and attempted Legend Of Queen Opala maybe 4 times and have decided that I'm done with it. I'll wait for the mod that lets you skip any and all grinding and walking around, then we'll talk
Renpy, coz we usually get Android ports out of it and I can play it on my mobile. Unity or other platforms it usually is harder to port to Android so usually can't. Also I normally feel that Renpy games are faster than Unity
As for RPGM too much grinding tbh. Much prefer visual novels.
the ones i liked everyone already said so will just that i hate the one thats not so famous but some people used do make visual novel with that is so bugged and slow to play
one they know how to utilise i dont have too uch aversion to any engine except maybe rpgm but that is mainly since alot of them dont utilise the engine and would be better off as html or renpy vn's