Having tried keepassxc (the current default in Whonix 15) I consider to avoid it and use keepassx instead.
Main reason is I dislike the AutoType feature that can’t really be fully disabled as far as I’ve seen. I prefer not to have an app (especially one that is used so frequently) that sends data (and in this case, very sensitive data) to other applications in this way. Too easy for mistakes to be made.