I don't see that the dampers will be the differentiator between the leaf spring back end or the 5 Link.
You can just as easily soften the dampers to make a leaf spring set up slightly more compliant but as I see it the spring rate is the spring rate regardless of the type of spring.
And also, they both still use a solid axle so no difference there.
Unsprung weight maybe?
What am I missing?
This assumes a properly located leaf spring setup. Panhard rod and maybe anti tramp bars on higher powered cars.
