If you are paying for Pass Plus or Proton Unlimited then you have integrated 2FA/TOTP which Bitwarden also makes you pay for, same with Yubikey/FIDO2/etc 2-step login, which I think is possible for signing into proton pass.
And no desktop app for proton pass, maybe some day though?
Really, I think the alias feature should be added into protonmail and removed from proton pass.
Bitwarden UI has the edge though, imo.