I went with the crit set for disc pvp. Quite honestly, I find it more useful seeing that 3v3 matches are so short that you got no time to even think about regen.
With full furious healing armor set, you're at some 11% crit with around 400mp5.
With the same, but "dps" set - you're at some 21% - 22% crit (plus 5% from holy specialization) which is great in certain cases, and mp5 is around 200. Seeing MP5 is getting buffed and we got practically no such thing on our healing set, I'm going to stick with crit one.