I haven't tried openEmu though. You have retroarch also, but there's a couple of systems it doesn't do if memory serves and the UI theme while very retro if set on RGUI, isn't very handy, it's prone to "my 9 years old cousin fucked everything again by clicking/pressing on a ll the things" error https://youtu.be/1k2NSZ3SvrI?t=194 If a 9 years old can be lost in it and can fuck the settings then it's a bad UI, for a megarcade machine, but that's just my opinion. An arcade machine or a console, you press ON, there's no bulshit it goes straight for the action, to me that's how it should be, there's no way to fuck it up, even a drunk and retarded kid can handle it safely and easily, that's how it should always have been