It is all in dynamics and design.
I would not say that the 2 cams are faster,or slower.
If you look at the blacknight or any of the extremely fast bows,the design is either pushing no braceheight hardly at all or is very short in axle to axle,usually.
The sampson is fast because it is supporting 80 pound limbs.
The allegiance is 33" and is faster than the switchback by 10,but the same size bow in specs there close.Why?