I'm happy to hear our export worked well for you. We spent extra effort there to make sure our export format contained enough structured information that it could be imported properly elsewhere. I hate data lock-in and we wanted to make sure you wouldn't be locked into 1Password.
I hope we can win you back someday.
++dave; 1Password Founder.
Transition is as easy as exporting your 1P database and importing it into BW.
Integration in IOS is very similar as 1P.
Overall, 1P's apps are more polished than BW. You notice it when you migrate over and after a while you forget about it.
There's one caveat and that is you've to pay BW $10 per year to get TOTP/2F AUTH support and offline support in the apps.