I use Starling for business banking. I don’t like their UI much at all, especially for business, a flashy circle as the home page showing daily spend is particularly useless. Categories are also entirely unsuited to business use, and with the forum shutting down, their engagement with customers is not good. Not as bad as the Atom bank UI but it’s not great. It’s serviceable, but I’m going to move back to Tide next year. In comparison with Monzo I’d say Starling don’t have a very good UI (the Monzo feed is way better as a way of keeping track), and are not as friendly (see policies like not allowing you to reopen an account for 12 months) but in comparison with a legacy bank it might be fine.
To go back to Revolut, they seem to be trying to do everything, with minimal customer service and have questionable ethics IMO. Not the sort of values I’d like to see in a company holding my life savings.