Until tonight, I would have said AD2. I have an AD1 and just started playing with nitro STs. I am learning fast, but saw a GT2 for the first time tonight. Granted, the driver was VERY good, but his GT2 was dialed in. It could turn like I could only wish my AD1 could turn. I almost let the owner of the GT2 drive my AD1 to see what he could do with it but my throttle servo crapped out and I didn't have a spare with me. I was blown away by the GT2. It may be my next purchase.