Indeed. With the improved input recording, fba has an advantage over mame. I also prefer fba's interface much more. I don't think I will bother with mame anymore from now on. Most of my favorite arcade games are already emulated on fba anyway so I'm not really missing much.
Only thing I can't play on fba yet are some Namco classics I really enjoy (Valkyrie no Densetsu,
Purikura Daisakusen, Burning Force, Marvel Land... etc etc). There are no namco drivers on fba at all yet, but I'm still hoping they will eventually be added someday.
The favorites feature sounds interesting by the way. It will certainly be nifty having it on the official fba. Good luck!
Late correction: Purikura Daisakusen was actually made by Atlus, not Namco. Sorry for the confusion.