On the contrary, it's a question which cannot be answered without specificity. Each AT has... what, 100+ combinations of primary/secondary, each of which will perform differently, plus pools, enhancements, accolades, the testing field (critter defenses and resistances, level differential, etc), attack chain and a host of other things to take into consideration. Attempting to compare them based simply on the AT designation, like one would compare classes in traditional RPGs, is moot. It doesn't work because the sheer number of variables is too large.