Quick Simple Question: 1/2 or 2/2 Imp Judgments?
As the previous replies indicate...it's a personal choice. Neither is "the best". All three can be useful, even if it is situational.
As to changing your rotation if you use judgement to pick up an add; if it's off cd, you were about to use it anyways, so at most, it sets you back one gcd in your rotation. Learning how to re-establish your rotation when it is broken separates the good from the average.
As prot, I have had to do might before, especially in 10 mans.
We've all had mana issues sometimes. Managing it is one of those abilities separating good and average as well, but if you are still learning that skill, benediction could be the best option for you individually for now. It's not like you can't change it later.
"he doens't need healing, he doesn't need healing, he doesn't nee-WHAOSHIT!wtf was that man!". Please stop leaning on TDR. -Teng