moose;d-35889 wrotePlaying 5 card draw. Which hand is stronger vs your opponents?
If we're just ranking hands by strength vs opponents' possible hands they are equally strong as your opponents will need quads to be stronger than Aces full of anything. Anything that AAAKK beats, AAA99 also beats.
If we are taking into consideration the hands we are beating that are more likely to pay us off a greater amount of money, we want it to be more likely that an opponent can have Kings full so AAA99 would be "stronger" in that sense.
Like I said, the definition of stronger matters.