ArborJet is more versatile in my opinion. There are also pictures out there of damage to the cambium from the Wedgle system...but I am not sure how typical that is. Any injection misused will cause damage.
If you are using Tree-AGE, I am not sure you can get enough in using the Arbor Systems. I say that based on my experiences with the Quick Jet...looks similar to the Wedgle. The Tree IV is MUCH better. I own both, and never use the Quick Jet...because it is not very quick. I do not own anything from Arbor Systems. I have looked at the system and talked to them about it at tradeshows, but just can't see why, honestly. Maybe others see it differently.