Are some External Storage options faster than others?

Example: I have a web disk I could mount as WebDAV or sFTP. Is one preferred in terms of speed when accessing?

I understand that mounting this disk as external storage can slow it down, but I’ve noticed that viewing is really my only option with web disks. Accessing via a standard FTP client is much faster than accessing through Nextcloud, so I’m wondering if there is some step I’m missing to close the gap.

Would using a method other than WebDAV or sFTP improve speeds when mounting external disks? Thanks!