Attract mode shows a menu to choose emulators quite attractive, as its name suggests.
In the image found on the forums, you can run both on a Raspberry Pi 1 or a Raspberry Pi 2. Has Joystick support via GPIO, and much more...
It has several languages and is multiplatform. It comes with MAME and with typical features as a simple adjustable system configuration from a text file, support different types of image formats and even video, mapping buttons, etc.