A simple poll does not give you the full answer, so here are my thoughts:
I separate my browsing categories, just a little bit differently than you do. That said I also have a browser for opening random links and doing general information gathering.
This is set as the default browser. To choose it, there are only two cafeterias. It should be optimized towards privacy (ad blocking, cooky separation, forgetfulness) and most importantly it feel good to use (fast, responsive, not requiring extra hoops to jump through).
Then there is a browser (are browsers to compartmentalize) for stuff you log into, visit and use regularly. This one gets an extension for the password manager. It should also block ads (maybe with an extension) and provide basic privacy. It should sync with your desktop browsers and allow for using websites as (pseudo) apps. Being comfortable is a huge aspect of the whole thing.
We can’t actually tell you, what should feel right to you. I can tell you to step back from fuzzing over every detail and just taking what feels best and accept the flaws. Nothing is ever perfect.