There was but a handful of King Tigers, thousands of Shermies.
While the Shermie was not as heavily armed as many German tanks, once it had the 17 pdr, it is one of the best Gunned tanks of WW2. It is also faster and more maneuverable than the King tiger, as well as endurance is a lot more.
The King Tiger had some problems. Such as being underpowered, Too heavy, Steering control problems, short legged etc.
(all factors that wouldn't do too much in AH, but we aint getting no King Tiger anyway
)