The paid brave VPN service? If so, I can't speak to it because I have never used it, but I assume it functions much like a normal VPN provider where they're running their own ad block lists on the exit node, but I have no idea what those lists are or their effectiveness. And yes, that would prevent your from concurrently running another systemwide VPN tunnel.

Firefox with uBo is good and not trying to convince you to abandon Firefox on Android, certainly not for your desktop OS.

The issue that thought is OP is referring to is about security, and while privacy and security aren't mutually exclusive, sometimes you trade off one for the other.

Personally, I prefer Chromium forks because I already take other privacy measures that I'm content with, and I would prefer the security advantages those browsers provide on Android.

But sometimes, if there's a website that I trust is not malicious, but there is an extension I prefer to view it with, I use Mull or Ice Raven. Both being Firefox on android forks, the former being a security/privacy hardened variant.

I want to reiterate, that this is only in regards to Android browsers and I'm definitely not saying to install Google Chrome, or even Google's own Chromium. I'm talking about hardened forks of their open source chromium project, such as Mulch and Cromite.