I am using firefox and I dismiss Brave because Chrome already is a monopoly. Firefox only has a tiny minority in total traffic and it's mostly from more technical users (a "technical user" would be anyone able to download an install a different browser). It is impossible to fight the current monopoly which spans across devices. The only chance we have right now. There is no way Brave or any other browser can gain enough market share to counter this except FF and even for FF the odds are slim.

The second reason I dismiss Brave is that it doesn't really provide anything innovative. It's not just about ad-tracking. We need also decentralization and new ideas on how we consume and organize information. Brave is just another for-profit organization which also makes a poor root of trust. (while Mozilla isn't any better here and also depends on questionable sources for funding the point is Brave doesn't disrupt here).

I'm not saying Brave is bad because any contender that can reduce the share of requests from Chrome vs the "Rest" is welcome. Maybe one day we have a world where 50% or less is Chrome and the rest is a mix of many different implementations. For this to happen the whole web would have to be re-envisoned because right now companies can't even bother to support the testing of more than one browser. So practically with how things are right now we will probably not have more than 2-3 contenders at any one time. And for this reason my personal vote is for FF.