Gotta go with the BR. It feels to me like a jack-of-all-trades precision weapon. You can be accurate at mid-range, somewhat accurate at long-range, and can use it effectively to some degree at close range. The DMR just feels to me like a nerfed sniper rifle. The light rifle just feels like a re-skin of the BR. The carbine also feels somewhat like a re-skin, but at least it's firing mechanism is single shot instead of three round burst, so it's slightly different.