Descendant vs Mastery: which offset vibrato should I buy?

The Mastery Vibrato has been the aftermarket tailpiece of choice for many Fender Jazzmaster and Jaguar players for several years now, but Chris Swope's Descendant Vibrato is an innovative new design that allows the user to adjust the depth of the unit to increase downward tension of the strings at the bridge. Can it knock the Mastery unit off its perch?

Here, Michael James Adams puts both products through their paces and shares his thoughts as we take a deep dive into the world of retrofit offset vibratos.