Is a plastic cutting board better than a wood cutting board?

As with any cutting boards, you should definately replace any worn out or heavily scarred board as this could be harmful as it traps food and bacteria in the cracks and cuts. The advantage of a wooden board would be that if food bacteria does get caught into cuts of board they eventually die off. As for plastic it usually does not die off and you are more prone to bacteria. With glass you would not have this issue, as it most likely will not get trapped into the crevices as there wouldn't be one. Glass boards aren't very popular and are usually hard to find. The disadvantage of a wooden board would be that you easily scrape and cut the board up with a knife while cutting. With plastic it is always harder to cut through with the knife. Finally, for cleaning purposes you can't say whether one is better than the other, if you sanitize the product you will be okay. There are advantages and disadvantages to both, but overall it is just a matter of opinion.