Some more threads on play kitchens:
https://www.daycare.com/forum/tags.php?tag=play+kitchen
It looks like the plastic one would be more durable. The wooden one looks great and to us adults seems more "likable".
Do the kids like the plastic one? If so, I would keep the plastic and sell the wooden one.
The wooden one would be a better "seller" to the ones that have money.