between those I would go for a GTP. They are (in my opinion) more handleable with training not to say that an emerald will not tolerate it.
Myself, I have a GTP which we can handle, and an ATB that is all attitude and does not tolerate it at all right now. In the fall I will be adding an adult 1.1 pair of ETBs which to my knowledge do NOT tolerate handling at all.