hello hello,
I’m using piFBA and I do confirm that neogeo games run flawlessly with this emulator (except 2 of them: Zedblade and Riding Hero, you have to use mame4all). No need to unzip the roms. You can check this thread for more details:
https://www.petrockblock.com/forums/topic/a-couple-of-questions-for-running-neo-geo-on-pifba/
oh and MvC runs also without any trouble on piFBA (check the supported game list HERE).
hope this helps!