The Sephora Collection Pro Bronzer Brush #80 ($34) is the largest brush in my collection, and it's perfect for an all-over glow. I use this to dust on luminiser or bronzer — and the big top means it easily covers a lot of surface area so the product doesn't end up cakey or blotchy.
I've also used it to apply finishing powder in the same broadly sweeping way, but it tapers into a dome-shaped top so I can still hit my high points with extra colour (of blush or bronzer), as needed.