Dear friends: Through my audio life analog experiences I found out that the enemy is " metal " no matters where, what kind or how is used. Unfortunatelly sometimes metal is the way to go.
I owned and still owns several mats almost all the ones you name it here and other custom made ( including the MS. ) and till now the one at the top is the SOTA Suoermat that in theory has the same vinyl , SOTA never disclosed its real blend materials used with.
When SOTA started to market its mat they did it along its very good reflex clamp ( that I owned. ). Today Basis Audio has same type of clamp that beats the SOTA reflex.
I'm not talking here about the lewm problem with EMI that needs a metal mat to disappears the EMI problem, it solves that problem but can't solvees the way all metals tends to resonates in easy way: can't stop the feedback comeing from the LP underside to the stylus tip again. The SOTA mat almost eliminates/changes the frequency of that feedback to a range where it's not a quality degradation on the cartridge signal or at least put at minimum.
What will define on each one of us which mat is for us depends on each one MUSIC/sound targets and the audio system quality and resolution.
Diferent persons with the same romm/systems could like diferent mats. In that Analog Planet research the most notable information is that 42% of the audiophiles just did not listen any changes ! ! !
Anyway there is no doubt that mats and clamps makes a difference.
Regards and enjoy the MUSIC NOT DISTORTIONS,
R.
