As long as I can isolate to being against one player I prefer JJ because it is too powerful, whereas AK will include more complete bluffs that are riskier.
If it's AK vs JJ, it really doesn't matter. I have JJ, he hits a K, I have AK, board comes 2359T (to keep me in the hand) or AKTTJ (just because they can). I hate them both the same way. Give me KK and I don't care what he has
it is clear that I prefer the finished party, as it is already certain that it is certain, and it is not certain that the other will come up with something.