If Android, for about as simple as you can go from a setup perspective, Lemuroid has solid support (through retroarch cores) for essentially everything through the PS1 era. It's essentially a pared-down version of Retroarch for people not interested in fiddling with as many settings who just want to scan a folder for roms and play games.
If you're looking for more fine control or a broader list let me know and I'd be glad to elaborate.
Android or iOS?
If Android, for about as simple as you can go from a setup perspective, Lemuroid has solid support (through retroarch cores) for essentially everything through the PS1 era. It's essentially a pared-down version of Retroarch for people not interested in fiddling with as many settings who just want to scan a folder for roms and play games.
If you're looking for more fine control or a broader list let me know and I'd be glad to elaborate.
I'm on Android, so I'll check that one out. Thanks!