Plastic playhouses are quite hardy. There are hardly any complaints regarding their construction. They're also less likely to fall apart or deteriorate. Most families pass plastic playhouses around like baby clothing. The lightweight construction and the portability aspect of the units allow them to be easily thrown into the backs of minivans or trucks to take into another house. However, they require some scrubbing and the color of the material can fade.
As for wooden playhouses, the longevity can vary. There are types of wood that warp, so it’s important that you ensure the one that you get is made of hardwood. It is worth investing into as when your child outgrows its playhouse, you can use it as a storage option for your kid’s outdoor toys or your gardening tools. This is only possible, of course, if the wooden playhouse is made of either oak, maple, or cherry.