I am at the moment also trying out password managers and searching for the best one. Lastpass so far has the best features, great password generation. But on Android it lacks a good and decent integration in finding and selecting the correct password for an app. Seriously bad. 1Password is better in this regard, but you can not swipe the 1password "click here to fill out with 1password" away. So also definetly a dealbreaker. But 1password is great at only showing the correct password for your app, after selecting it once.

Regarding the user interface don't get me started on keepass. It was recently forked into keepassxc but the chromeipass/ foxipass integration does not work all the time. Also love it if a website just shows your username already and you have to fill out the password and can't use hotkeys. (I am looking at you google) Lastpass can do it successfully, but keepass...

The Android interface was last tested a few years ago by me and it only had a notification area you had to always show. I don't know if it is much better at the moment.

Regarding your password security: Lastpass itself encrypts your passwords and hashes them thousand times. You can also manually adjust the hashrate to even more. So even if lastpass would get cracked. You would have to try out every possible hashing number with every possible password combination. So thats a plus. Well compromising your pc and installing root would be your least concern. It would be easier to steal your phone, get your fingerprint and unlock your database this way.

You can never be 100% secure. But have to choose your best way of doing it.

Also i am open to suggestion regarding a great password manager for android. Will have to try out keepass and dashlane again.