Short people (with some exceptions of course) are the strongest people in the world. Go to a powerlifting meet some time. If you are over 6 foot tall, you are a giant there.
However, there is a difference between gym strength and functional strength. Just ask B-fold the Truth, when putting a 300 pound rock on the top of a barrel, it helps to be big.
In my opinion, powerlifting is for short strong people, while Strongman, and highland games is for tall strong people.
Just my 2 cents.
B.
And by the way, I am short (five foot seven)