H3LZSN1P3R
You're doing it wrong
they both move the axle the same as the control arms for the coil sprung push the axle back as the springs compress the same as a leaf spring does.Coil sprung trucks' axle also moves laterally where a leaf spring doesn't (or isn't supposed to and therefore significantly less by design). The coil spring perch is also inboard as compared to the leaf.
Inboard coils only really change the stability
Not saying leafs are not better but coils are way underestimated considering the factory coils going by the spring rate numbers on my truck are rated at 6700lbs which is more than the axle cap put in place by ram engineers