The features of NTFS to supposed Fat32 is security (file encryption/permissions), large-file/partition support, raid support and a few others. so,
Capabilites: Security, although you wouldn't need that.
Stability & Performance: I'm sure there'l be a slight increase, although today, everyone should be using NTFS.
I suggest you move GTA SA to your local drive, to supposed a flash drive.
Kind Regards
Sisko White