If it’s for backup, zfs and btrfs can send incremental diffs quite efficiently (but of course you’ll have to use those on both ends).

Otherwise, both NFS and SMB are certainly viable.

I tried both but TBH I ended up just using SSHFS because I don’t care about becoming and NFS/SMB admin.

NFS and SMB are easy enough to setup, but then when you try to do user-level authentication… they aren’t as easy anymore.

Since I’m already managing SSH keys all over my machines, I feel like SSHFS makes much more sense for me.