because the raspberry pi is not powerful enough to run the latest mame version (which has the largest rom set), so we’re left with various previous versions, all of which support different sets of games (as mame matured it supported more games, and even different ‘rips’ when better ones appeared). eg, 2000, 2003, 2010, etc.

of these previous versions, the pi1 can cope with the earlier sets/cores, the pi2 with later, and the pi3 with presumbably later still. perhaps once more users are available to test these things we can work out the best choices for different systems – you can help!