Which tripod apex material reduces vibrations better, magnesium or aluminum?

One or the other material is used in the top part of photography carbon fiber tripods.

But which is better for damping vibration, a magnesium cast or an aluminum alloy?

If possible, please provide evidence based answer(URL).

UPDATE:

Let me elaborate please. Top spider/Apex and leg joints of carbon fiber tripods are the main areas of the tripod where either magnesium or aluminum, can be used. Just assume that, there are two similar carbon fiber tripods in every way, except at their top spider & leg joints (the assumption is to neutralise other factors).