I used SW 6258 Tricorn Black Paint. We used it for the ceiling. The rest covered with different fabrics. Just finishing the theater so I am attaching a sample picture here. I thought it turned out to be really good. This paint has an LRV rating of 2. Hope this helps.
Without question the Rosco Supersaturated is the blackest paint, but it requires a bit of thinning to make it more viscous and usable. Doubtful you'll notice much of a difference between the Rosco and the Mouse Ears in a darkened room, though.