So I know this may be a case of fluff != rules, but it seems like if we were going to go by fluff, beasts would be a higher mat/rat than jacks almost always, or at least, outside of uniques.
For instance, on one hand you have a crusader, a robot built using steam technology to do battle with a cortex, an old-school AI. On the other you have say, a shadowhorn satyr, a warbeast who is an aggressive, savage, natural fighter. Now if this were super advanced technology, I could see the machine being more accurate, but this is steampunk. Why would a natural fighter who likely has years of practice hunting have a worse MAT/RAT than a robot made by religious zealots using steam power?
Why are warjacks more accurate than beasts? Again, I could understand if these were highly advanced targetting systems and such, but from what I remember cortexes were just crude mechanical brains/AI.