Both the Critical Mass and the HRS platforms are excellent. I just ordered an HRS platform for my Clearaudio Performance DC. I've used CM platforms in the past but my dealer carries HRS so that's what I went with. Also I plan to upgrade my table to an AMG Giro and they recommend HRS. Good Luck!
I do not have experience with Critical Mass, but can attest that HRS has an excellent customer service, should you need to modify your platform down the road. I had to get low frequency absorbing feet when I changed furntables and they were super responsive in making sure that I got the right product.
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