I don't anticipate it would make much real difference. The trick with console emulators is usually making the graphics, audio, and game-specific quirks sing well on commodity hardware rather than the specialised hardware the console has. Getting ARM code to run on Intel isn't the hard bit — so getting ARM code to run on ARM may well be more performant than running it on Intel – but rather the trick is getting all the other precise console-specific hardware to sing with available cross-platform frameworks for audio and video.
