I've tried all three, and still can't get one to work exactly correctly.
Virtuanes - gives me a black screen when I try to launch a game from inside of Mamewah.
I have to use the task manager to end the task, then I can see the game for a split second before it exits.
I don't hear any sound, so not sure if it is popping up under Mamewah or not.
MESS - when I run a game from Mamewah, I have to hit a button for it to continue into the game.
When I get to the game, the emulator runs too fast, and the menu bar is at the top of the screen.
ESC won't exit the game.
FCEU modded to exit with ESC - Won't go full screen.
I go to the menu bar configuration and go to Video and click the Full screen.
When I click OK, I get an error saying: DirectDraw:Error setting display mode.