Tuff call.
There are mats that damp your platter well...and there are mats that provide good interface with your record without overdamping.....but they rarely can be found in one.
If you have a direct drive table - damping your (oft) ringing platter is imperative for good sonics.
The best combo I have come up with now on my DD table is an Audioquest sorbothane mat damping the platter...
and a Herbie's Way Excellent mat on top as record interface. It provides the necessary attributes for good sound.
If you have a belt driver, your choice in mats is probably easier. Your platter is already well isolated by (rubber) belting....so you need to find the best mat that interfaces with your record (primarily).
Either with belt of direct driver...damping the underside of your platter is advised and a reliably helpful tweek. Look thru the Vinyl Circle for scads of helpful TT tips and tweeks