QSP performs really well with some truly massive games. There are a limited number of good (in my opinion) QSP games, however.I get why people use RPG because it's good for fight mechanics. Though terrible for everything else, so I never play RPGM, because (the obvious) I'm not here to play fighting games.
I have no idea why people use Unity, though. The textures are great but the gameplay seems almost uniformly terrible.
The only alternative to Ren'py I have come across that works even halfway as well is Godot (used by dev of VIRTUES and PHOENIXES).
This site provides links to other sites/services, and does not store any files