From level 85-90 I frequently switched between Holy and Disc through dungeons. I plan to only PvE, and I just can't make up my mind on which one to play. I really like both, and both seem to be very viable. The only difference I can see between the two, is that I feel more secure with my mana in Disc spec (rapture). Other than that, I just can't make up my mind on which to play.
Any opinions on why you play your spec? Pros - Cons?