there are too many things to list here that make it better than at3, fusionx gave a pretty good example of a kick ass feaure.
one more that i like is the ability to adjust skim on the fly with the dynamic skim settings. It basically gives you an option to have a different skim if your overall % to trades drops below a certain thresh hold.
also the ability to give bonus hits to trades that reach a given ratio..
not to mention the fact that at3 you are limited in the way you trade. Its either full, or capped. With atx you can go by clicks, hits, AI full, AI capped.
Oh, plus there is a cool trade boost feature in atx
