I feel as though "we" have been down this beaten path before -- deja vu.
If you have an offhand item like Garbok's Chalice you could benefit more from EDrain. Nevertheless in PvP i would still stick with MoR especially now as Max noted, it acts as a much needed cover enchant. Divine boon gets stripped you can only reapply it every 10 seconds, that can be a life time for a boon prot monk under pressure.