Any of the known ones, like all the guys you listed, play so close to the original that you'd have to be a snob to find a difference. Personally, I have a 6 Pac kit in my Ms. Pac and love it, but it doesn't save high scores.
I read that some of the high score save boards mess with the logic of the ghosts. If that kind of this is important you, then you might want to research it a little.
If you are asking why Player 2 score is visible in a one player game, it is to identify my kit in a machine when I walk up to it. With almost 3000 Pac kits sold, I have found 2 in the "wild"....I like that.