I am a huge fan of Recalbox. You only need to write the image and it is ready, all emulator keys preconfigured :-) You can copy roms via a network share.
I concur. I tried RetroPie and it asked for my keybindings on my controller on start, but when I started any Neo-Geo game, the keys didn't work. No such problem on Recalbox.
(Except for sound not playing on some ROMs)