I guess my question is more, is the “brave” one as good as uBlock? Or does it miss some things? Sounds like performance is better.

My only thought about using both would be if the “brave” version is more performant, but less protective, it could quickly get rid of most of the ads, and let uBlock get the rest, reducing how many are filtered at greater performance cost. But I’m sure that’s based on a gross misunderstanding of how it all works.