I know which one I wouldn't pick for five billion files, that's for sure. EXT4 prepays for some of the work at mkfs time, but it also has certain limits. XFS ca

I know which one I wouldn't pick for five billion files, that's for sure. EXT4 prepays for some of the work at mkfs time, but it also has certain limits. XFS can create as many inodes as you want, if you have the space for it.