I think the ATR is a newer tire. I can only comment on the regular Scorpion A/T, but maybe that will help? I went through almost 3 full sets of the A/T's and I liked their onroad traction and handling (except compact snow and ice). Unfortunately, I had a hard time keeping them balanced and 3 of them developed sidewall air leaks. So I guess in terms of driveability I would recommend them, but the overall quality is questionable, IMO, which would strike them off my recommendation list these days. In comparison, the BFG A/T's that I am running now don't have the same level of dry road traction, but they are better in fowl weather, more quiet, smoother riding, and so far the quality doesn't seem to be an issue. Anyway, I don't think you can go wrong with the BFG, and there are reasons it's the #1 selling A/T despite it's higher cost.
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ChuckH
"Every morning when I wake up I know it's not going to get any better 'til I go back to sleep again!" Al Bundy