We have all three, mat, plastic and wood. Mostly use the mats and plastic boards in the kitchen, but come green chile time, wood works better for processing chiles. My dad left me a bundle plus of oak flooring about 1.5" wide. I cut those about 10" long and glue and pipe clamp them into boards about 8x10, and cap the ends with walnut, then soak in mineral oil. A couple have split, but they are cheap and easy to make. The way we process chile is, put the board in a large cookie sheet, scrape off any excess peel, cut the stem and remove the core and most of the seeds, and then scrape the waste of the board and grab another chile. It works well, wife and I can process a bushel of roasted chiles in an hour or so. In September, we'll get 6-12 family members and friends over and process chiles on folding tables out on the lawn, taking bowls of finished chiles into the house for further processing and freezing. Wearing nitrile gloves with the obligatory bottle of beer by your side, naturally.
Guess I got a little off topic there, but wood works better because of the thickness.