The main question on cutting mats we seem to be asked is;

"Which is better, a self-healing cutting mat, or a glass mat"?

Our personal choice is for the self-healing mats, if you set the blade of your cutter to just cut through the paper, it does a great job and keeps the blade sharp.

The Glass mats we have used also work well as long as you don't push down on the blade with too much force. Using too much pressure will scratch the glass and will cause your subsequent cuts to suffer if they cross those "scars" as well as blunting your blade.