Mostly I use plastic boards. I have a couple of thicker ones that have gotten stained over the years and I should probably discard (one got melted on one corner when it got shoved onto the cooktop and doesn't lie flat anymore), and some thin flexible ones I like a lot, but my favorite knife (a Shun "Alton's Angles") tends to cut right through it when I do fine chopping and mincing.
I also have this massive 15" square, 4" high block made of laminated bamboo that's a joy to use -- impenetrable and heavy. It also raises the countertop up to a more comfortable level for me. I tend to put one of the flexy mats on top of it when I cut proteins. Its biggest downfall is its weight and the fact that it has a gutter routed around the edge, meaning that I can't sweep crumbs, chopped herbs, etc, off the surface.
What is patriotism, but the love of good things we ate in our childhood?
-- Lin Yutang