Does Donenfeld vouch for Tunsafe? I'd be reluctant to use a WireGuard client he didn't endorse, if only because I've been on the sidelines in conversations about VPN client software vulnerabilities and I know he's careful about this stuff (Donenfeld's background is in vuln research). There is more to get right than just the protocol.
I don't think he does, Tunsafe implements Wireguard, but it hasn't been updated for maybe 2 years now. Still, the UI is so much nicer than the Wireguard one
If the UI is more important to you than the security of your VPN, by all means but I think for most uses this is questionable advice. TunSafe development has been dormant for years, the official WireGuard client fixed one of its bigger Windows UI quirks just recently.