Plywood comprises thin sheets of wood that are glued together. Particleboard is composed of tiny wood particles kept together with adhesive. Both can be strong and durable. However, there are different grades and types of particleboard and plywood. One advantage of high quality particleboard is that it is more resistant to contraction and expansion due to humidity. As such, particleboard might be more suitable for high humidity areas. Our team will be able to advise on the better option for you.