Wood is superior. For years it was believed that wood was not sanitary...but recent research suggests it is more sanitary than plastic and, for reasons not completely understood, bacteria and other microbial tend to not multiply and actually die at an unusually fast rate on wood. As plastic boards are used, they can get those scar marks that can actually harbor bacteria.
From a knife's edge performance perspective in terms of what is easiest on a blade, wood is best. Maple is really the best of all woods, with cherry and walnut (don't use if you have nut allergies or cook for people with nut allergies) being considered good candidates as well.
And end-grain board will generally last longer than face or edge grain, plus it is much easier on knives. It does require a little more care, but it's a better board. Also, end grain cutting boards do not show scar marks like face or edge grain.
Bamboo is one of the worst materials for cutting boards because the high glue content and harder glue used is harsh on knife blades...and it dulls the living hell out of them compared to something like an end grain maple board. While often presented as the environmentally-friendly option, it's producing more waste than maple, the service life is much shorter because you cannot refinish a bamboo board, and the cost is generally much higher because you will have to replace them so often. One good wooden block from someone like the Boardsmith or Lone Star and it will last a lifetime (avoid Boos, they are very inferior to the other two). I also have a few Michigan Maple end grain boards I am very happy with, and you can often find them for under 50 bucks for larger sizes.