Full disclosure: I've never used 1Password so can't really comment on it compared with others, but I'm currently running a selfhosted Bitwarden re-implementation (vaultwarden) and am generally pretty happy with it. I've only ever used LastPass as a password manager before (aside from a seeding algo back in the day), and while I really don't like their business practices or security history, their extension has or at least had a bit better consistency on Firefox than Bitwarden does, at least with regards to detecting username/password fields and detecting when a new credential is being created and asking it to be saved automatically. That being said, it's something that I can live with considering it's free software. As far as I'm aware, in terms of features all the big players in that space are pretty evenly matched, though I do remember some advanced feature that 1Password offered over others; maybe related to privilege access management in enterprise.