The best use of a treble booster is pushing an amp that’s already breaking up, or another dirt pedal. That’s been my experience. I can’t imagine using one in any other way. They sound absolutely horrible into a clean amp IMO.
Having said that, the Catalinbread Naga Viper has gain (“heat”) and bass (“range”) controls. It is more flexible than a classic treble booster, and could be used in different ways, I suppose.