The problem with Death's March is that not only is D&D a 15s cooldown for us vs. 30s. for unholy, but we have a reset mechanic on it that procs relatively often. The best case scenario for Death's March is that you have a 50% higher uptime on D&D, but that's small beans compared to the RP return from the bracers for single target and the double Blood Plague damage from the chest for AOE.