Originally posted by efredeluces
my question is, which is most effective ? and are there any other versions of the same art ?
I typically don't like to get in the position of pulling my partner. I especially don't like to pull them toward me. It's something of a bad position to be in from a tactical perspective.
There are a great many variations of kotegaeshi. My particular favorite is to keep uke's hand very low to keep him off balance to his front/rear. Then I stop the momentum of his upper body by taking the slack out of the connection. Uke's body pivots around his center of mass and his feet therefore run out from under him.
Some of my friends named this "The Montgomery Plop" variation.