I think you're asking about the Samba share? If it works, there's no real downside except the speed and general wonkiness of the SMB protocol.
As I would rank the different options:
- Rsync+SSH would be fastest if you're sending entire directories and not packaging first. A bit slower if sending huge files.
- NFS would be fastest if sending prepackaged large files, but overall slower if sending a bunch of smaller files
- SMB will be slowest in any scenario, but may be easier for you
Yeah, one or the other works well depending on how your network is deployed. Example: Tailscale gets whacky when dNAT issues are present, but ZT blasts through.
Sounds like OP is having the opposite issue as you.