Hitch Hiker for me. I have a real problem accepting anything at face value without asking why? Even after being given an answer, if it does not make complete sense I will, much to the dismay of my former teachers, pursue it until it does. So telling me that, this is just how it is done, or this is how everyone else does it, has never been an acceptable answer.
This personality quirk has lead me to understand that much of what we think we know, we don't. It has also been responsible for my trying almost every tree climbing tool and system out there. This, though somewhat expensive, has left me quite confident in knowing that what I use is the best for the type of tree work I do.
I use the Hitch Hiker, not for any one of its abilities, but for the combination of them. Nothing else I have used has such a complete combination of ease of use, speed, safety and work positioning options.
Dave