Another pair that is most advantageous to split. Being dealt two Aces is not exactly the most normal of hands and it is probably the most fluid.
Obviously you do not want to play both Aces as 11’s since your hand total would be 22 and a bust. The other non-split option is to reduce one Ace to a 1, but then you hand total is 12—another stiff hand that is more difficult to win with.
A hard 12 is tricky because basic strategy says to stand if faced with a dealer’s 4-6. And while you will not lose every single time against those three up cards, you are defiantly the underdog in those instances.
So if there is another way out of being stuck with a hard 12 why not take it? Doubling your original wager and splitting those Aces will allow you to start two new hands, each with its own Ace.
The advantage is that you will be playing with two hands that each have a second chance built in. A third chance really when you count splitting them as the second chance to your hand—that makes reducing to a 1 as a fallback the hands’ third chances.
By splitting your Aces into their own hands you are playing with two soft hands. This is advantageous because if you hit one too high you can reduce the Ace from 11 to 1 and still have a shot at creating a good hand. Whereas if you were to split any other pair you do not have that fallback ability to reduce the value of a card like the Ace allows.
Being able to split a pair of Aces and then playing them as soft hands—with the ability to reduce the value of the Ace if necessary—is what makes splitting a pair of Aces so advantageous.