I use Firefox. I don't know what's a Brave shield.

I use uMatrix + uBO on desktop and NoScript + uBO on mobile.

I use uBO's UI mainly for the element picker. The part that reimplemented uMatrix is too hard to understand and to use, hence my comment about the teapot that pours tea from above the handle.

I'm using NoScript on my phone because it has a better UI for that. I use uMatrix on my desktop because it's better than NoScript. I don't use uMatrix on my phone because it's not available on mobile. I would if it was.