8.75 yoke differences

So which one would be stronger the 29 spline? I know with ratchets the fine tooth ratchet is actually stronger because it allows more teeth area to come in contact with each other. Is this the same rule on the yoke?

Yep. The 29 spline pinion and gear set are stronger not only due to more splines but also the O.D. of the pinion shaft at the splines is larger.