The required functionality can be provided by both NTFS and FAT.
NTFS will provide a sophisticated security features as the partition is so small but the NTFS files will consume a lot of disk space.
FAT on the other hand will not use much space but talking about security features, the read only feature can be granted by FAT. The folder can be shared and restricted for required user only giving the read-only right to the user. This feature is equally voted for NTFS and FAT
So FAT therefore will provide a normal functionality whereas NTFS would perform perfectly. Ignoring the consumption of disk space by NTFS.
