I was reluctant to say that wooden cutting boards are safer than plastic. Luckily, somebody else did a great job of assembling the conflicting research and concluding that it is inconclusive.
The bottom line is that careful food safety is vitally important regardless of your choice of materials. Wood is a better choice for the environment. My choice is this great board made from olive wood. I am lucky to be living in an area where olives are grown commercially and the wood is a byproduct of sustainable agriculture.
Regardless, that is a beautiful cutting board, and the fact that it’s made from a single piece of wood also makes it better for the environment. Less need for glues, pressure, etc.
I have a bamboo one but it is getting awfully splintery.