I don't teach ANY release that has people pressing their hands into the top of the horse's neck. If the horse were to need some rein, the rider would be unable to give it, since they are on top of the crest and locked in. Also, pressing onto the top of the crest encourages the rider to go too far forward with their upper body and "prop up" their upper body, instead of using their lower leg to counterbalance the weight of the upper body. I teach a "crest" release that has the rider pressing the hands onto the sides of the crest instead of the top of the crest. That way, the hand is able to give some rein to the horse, if needed.
I will use myself as the example of the releases I prefer. BTW, my lower leg is further back, here, than I like. I am riding very aggressively for time and I sometimes get a little sloppy. Oh, well...
This is the "crest" release I teach;
Notice the hands are on the side of the neck. It is not an auto release, due to the broken line from the elbow to the bit.
The auto release is what I want all my riders to try to attain. Some jumps, especially when going XC or riding for time, just are not where you would use the auto release. This is where there is a straight line from elbow to bit. This allows the BEST feel of the horse's mouth and allows the rider to adjust the reins as needed. This is an auto release;
My critique here is my hands are too open, not gripping strongly. This can allow rein slippage. Again, oh, well...
I hope this helps show the difference for you.