1Password, in terms of both UX and security expertise and track record. They provide mobile apps with a decent UX that makes use of device capabilities (e.g., biometric authentication) where appropriate, too.
And as much as I respect them and trust them on the side of creating a secure and reliable password manager, I don't trust them to build a secure and reliable cloud system.
So, I'm now looking for something else. However, I'm still looking. I haven't found it yet.