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Storm the Sorrow
I don;t know i actually find it harder to kill a good dk with Emp Seals, rather than with FV, with FV i can just burst through DK's D-cds and kill him under 40 sec window, while when i ever i pick Emp seals, fight drags on, and eventually i lose (but i suck /w Imp Seals, so i think this is the main reason). Rogues are easy in general, so not an issue for me.
Yeh Emp Seals adds flexibility, but it just annoys the hell out of me when you sit in a cc chain, and you lose your buffs, and u gotta stack them up again, it does not takes a long time, but its just annoying, and since this season i quite rated pvp till legion, i just run casual BGs and for those you gotta have DS procs for aoe down those fools (same goes for RBGs, FV hands down better).
On a personal note, my Ret atm is mastery specked (93% mastery self buffed, full pvp gear) hence FV is better for me, since Emp Seals go better with Versatility