Ive been using NTFS for my rom drive since I started using Batocera,so for about 8 months or so.
Seems to work fine for me. And yeah,main reason is so my main Window PC can easily detect it so I can easily ferry roms across when needed,and I use Scraper that way too.
(I boot Batocera from a sep flash drive)
For my RGB10Max..I also formatted the Share partition on the micro SD card to NTFS for same reason,have no issues there either.