Ok so I'm weighing in here too.
For Arcade emulation.. ehh.
For console emulation up to ps1 ... rPi all day. You can't beat the affordability vs a PC, and the NesPI case is so high quality it's insane. I didn't know about the stickers, but just ordered them and am psyched. Add in a legit NES/SNES controller with the BlissBox 4-play... and it's just way too easy and awesome.