Which is better: WebDAV or kopia server on remote NAS?

It has been a while, but I have returned to the topic and set up SFTPGo on the remote server. It was a fair bit more work than just using built-in Nextcloud WebDAV, and I nearly abandoned it since initially, I was very disappointed. But with a bit of fine tuning (see here) I’m quite happy now. So thanks again for the suggestion!