

Hi, I think OP wants their sibilings to directly connect to their PC, skipping any relays, even if it’s their VPS.
But if you are comparing setting up your own VPS instead of relaying through Tailscale’s DERP, then the answer is… it depends on the distance and whether you can establish VPS->Local VM direct connections.
I found opening a specified port for Tailscale on the VPS to help with direct connections with CGNAT’d peers. I’m not familiar with Pangolin, but I think the same principle applies as long as at least one address:port combination is agreed between Wireguard peers.
If I’m being honest though, before doing all this, try asking your ISPs for IPv6 to avoid these cumbersome things together.
Rsync depends on OpenSSH, but it definitely isn’t SFTP. I’ve tried using it against an SFTPGo instance, and lost some files because it runs its own binary, bypassing SFTPGo’s permission checks. Instead, I’ve opted for rclone with the SFTP backend, which does everything rsync do and is very well compliant.
In fact, while SFTPGo’s main developer published a fix for this bug, he also expressed intention to drop support for the command entirely. I think I’m just commenting to give a heads up for any passerby.