I've used it on my phone once, and had trouble trying to change my home page. Searching for it, apparently it was because of an option that was glitched. Turning it off solved it. This glitch was present for years, from what I read, and still wasn't solved.
It had the A.I. controversy that people mentioned. So I guess it's not very reliable in the privacy section, even if it's their main "appeal".
I'm using Firefox on both PC and mobile. Only experimented with Brave for a short time. Can't say much more about it.
For a second I thought it was a war scene, with the ships and flags.