Main difference I see is SirTunnel handles custom domains and auto certs easier. Also, am I reading correctly that the gist allows anyone to create a tunnel without authentication? I would definitely recommend setting up ssh keys and not doing that.
> It's that simple there's no authentication at all
In practice it should require ssh key auth, that’s what I’ve always done. But without requiring password. And limited to just being able to create tunnels via the ForceCommand sshd config.