I'd be interested to hear George's opinion (along with anyone else who has gone deep in the game) on what settings he feels are the most "appropriate" to compete on.
Edit: I posted this without seeing George's response.
I personally wish competition settings were on "Easy". I wish it was that way for all arcade games.
As far as personal bests are concerned. Here it goes.
Donkey Kong 3 MAME Easy 13.9 million
Donkey Kong 3 MAME Medium 6.1 million, I did get 6.6 million at RU, and I think those were on "Medium" MAME settings.
Donkey Kong 3 MAME Hard 5.9 million, Donkey Kong 3 Arcade Hard 8.7 million
Donkey Kong 3 MAME Hardest 2.3 million I think
I should note something. When playing on MAME I play on keyboard, and I play with the buttons it defaults to. So spray with my left hand, and controls with my right hand. So basically I am playing left handed when I play MAME. I play right handed when I use the Arcade controls. For me Arcade controls are much, much, much easier than keyboard controls.
Edit: I did use an arcade control panel to get my 13.9 million Easy score for MAME.