I have now tried the Olfa, the Quilters' Select and the Martelli. The Martelli did not heal for me and had deep grooves, and I had to sand it down to prevent cutting my fingers. It was also very heavy and cumbersome.
The Quilters' Select I don't love because my fabric slides around on it. The Olfa and Martelli have a better surface texture, imo -- no fabric slippage, so an excellent surface for both folding and cutting.
My only gripe about the Olfa, and the only reason I sought out other mats, is because it is so difficult to see to cut dark fabric on the dark Olfa surface. My solution is to keep my Quilters' Select under my Olfa, and if I'm having trouble seeing to cut, I will slide the Olfa back and cut on the light side of the QS.