Ok so pi play or retropie? I do like retropie it has worked great so far.
The only thing that ticks me off is no four player support..bomber man anyone? It can be done on a pc...why not port it over to the pi? Don't get me wrong I know programing is not easy (or magic

) I just figured that the underlying support was there...I tripped over my snes cord though I was fine killed the snes pad though
With bluetooth on board you should be able to get four wireless snes pads working great..or some xbox360/ps3 pads rocking. In fact if it will handle psx ok now I might build it into my dead psx case..one day..that would be..a pain? not sure...
I would like to get away from retroarch and make a multi emulator system like my pc...but I have to admit RA does do some impressive things..I was stunned to see samurai spirits working on my WII and then my PI