Wood. To clean just soap and water, unless there is raw meat then soap and water and a cap full of bleach.
https://www.nytimes.com/1993/02/10/health/wooden-cutting-boards-found-safer-than-plastic.html
"The scientists, Dean O. Cliver and Nese O. Ak, stumbled upon the finding while seeking ways to decontaminate wooden boards and make them as "safe" as plastic. Much to their surprise, they found that when boards were purposely contaminated with organisms like Salmonella, Listeria and Escherichia coli that are common causes of food poisoning, 99.9 percent of the bacteria died off within three minutes on the wooden boards, while none died on the plastic ones.
When contaminated boards were left unwashed overnight at room temperature, bacterial counts increased on the plastic, but none of the organisms could be recovered from the wooden boards the next morning."