Br and Dmr are my primary and seconday, Br for close range(most of the time), dmr for long range, it really depends on the map. Br has a bit of a drag shot, zero bloom, and a bigger reticle, where Dmr is a direct shot, blooms, and a smaller reticle.
The Dmr's range is easily better than the Br's, but if I had to pick, I'd pick the Br. :3