Proton I generally trust because they have made it abundantly clear just what they will give over to authorities in the event of a court order. I would rather it be less but I also prefer that over "We have your back and will fight the CIA if need be" nonsense.

That said: Bitwarden is still the kind of this. And the big issue with a keepass you sync (which I used to do) is that you can't really use that with yubikey style devices because it will get out of sync as far as the authentication codes go.

I love Bitwarden, but goddamn, they need to figure out form filling. They have my cards, passwords, TOTP, address, and name. And I always end up having to flip back and forth.

I still prefer Bitwarden because the server is source-available and most of the code is free and open source. There's also the FOSS Vaultwarden server fork that I can switch to at any time.

Proton Pass also using end-to-end encryption with FOSS clients is nice, but the server code is completely closed source.

Competition is always good.

Bitwarden doesn't have the best UX design

It also got a 100 million USD investment a couple of years ago and even if it hasn't changed there might be issues in the future and I really don't want to learn how self hosting working if bitwarden enshittifies.