The eternal question...
With KK you have a ready hand, with AK you still need an A to have top pair.
KK is really great, but lately I've been failing with it almost without exception, because the player playing with the Ax hand always get an A.
I think the only solid argument for preferring AKs to KK would have to be that in a race situation if an ace hits the flop the kings are left w/one out, depending on if the other two cards are straight drawing connectors. This would be the only scenario but it's a gamblers game now, thanx to Eric Persson, imo. 😏
Definitely the KK hand because I already have a pair in my hand, and the AK is highly flop dependent.
If Ace is on the flop, then KK is already a difficult hand, but I still prefer to play it more than AK.
I have had more success with KK, but I, v won more chips overall with AK.
Depends on so many variables, chip stack, opposing players styles. I generally limp with AK and see the flop. But raise with KK