Emeralds have way bigger teeth than chondros. Emeralds tend to eat birds more often and they need a good bite to hold it. Green trees tend to go to the lowest branch on a tree and wait out food. If nothing comes they move a few trees over and try that. They pretty much pick a tree and stick pretty close to it their entire life in the wild. I've never seen a grounded chondro eat, but I'm sure one in nature would with the amount of food they see. Many people believe a quality CBB emerald is much more holdable that a quality cbb green tree. I do not keep emeralds, but know many people who adore theirs.
Aaron from Iherp said it best. "green tree teeth are way over rated and way under rated at the same time." Just for the record, many snakes of the same size hurt much worse....Carpets, white lips, and scrub.....
All info on the natural green tree info above comes from my vague recollection of "The More Complete Chondro" by GM. Someone chime in if I'm mistaken.