I think that glass is better for tree frogs, but as long as you are able to maintain it, I think wood would be fine. Tree frogs will always enjoy height over width. I have a 18x18x24 Exo Terra and I love it. The maintenance is really easy. I know this probably isn't much help, but as long as you make sure there is enough space for the amount of frogs you are going to have, and that there is substantial height, your frogs will be happy! Have you considered a Whites tree frog?