JasonNumber100: They are unpredictable.
They are actually very predictable, You just need to spend the time learning how they will react in different situations.
I have used the ATV's and prefer the CG's. I am by no means saying that is correct, it's just a personal preference. I'm sure there are quite a few players that prefer the ATV's. I don't think there is a wrong or right, whichever you choose, just practice practice, practice. That will take the "unpredictability" out of which ever you choose.