Been a longtime user of Bitwarden (free, and over the last year paid). It's a straightforward/good but a bit boring UI, connects very well and easily into browser, phone etc. Works well, highly recommended, and having 2FA on paid version is awesome.
Been trying out Proton Pass for the last few days since I already pay for Proton Unlimited. It's got a good UI and so far it's been working well in Firefox and on my phone. It's much better integration with Simple Login features so I like the slightly more seemless sign-up ability. It's not 100% feature parity with Bitwarden paid though.
Bottom line - I prefer proton pass as a heavy proton user already BUT if I just wanted a standalone password manager, Bitwarden is probably better. Both are good options though, and competition is good.