It’s about the shape of the mound inside the bucking.
Decepticon are “arrow” shape^ like so, autobot are diamond shape <> like so, autobot have a larger surface area so give the BB more backspin = more range. The decepticon puts the backspin in a certain spot on the BB and therefore not the whole BB has this “interaction” and therefore less forces to move it from its intended target.
There is a video and a better description on the sniper forums about this.
This description is very vague so take it with a pinch of salt. If I was you, I’d look at the Autobot 60 or 70, 70 will last longer, but 60 is possibly better performance.