Which Insulator is the Best?

We want to answer the age old question, that has been around as long as there has been electric fences, what insulator is the best? Which one will hold the wire but when it gets jerked out not break? Well, we have a test post; one post with three different insulators on it. The white insulator is a Gallagher wide jaw pinlock insulator, we have been told that it  does a better job of staying on the post and not breaking, we shall see.