I've tried both OEM and Aftermarket
I've tried both oem and aftermarket kits on Honda Odyssey.
IMO, OEM is the way to go even though its not "real" wood. I think the oem is better because the oem dash kits are plastic molded and already "formed" to the contours of the dash. They fit great and are easy to install.
The aftermarket kits, although "real" wood, are not "formed" to fit the dash contours. You must heat the dash, and the kit pieces with a hair dryer to make them pliable, so you can bend them to fit the countours and so they will stick. They don't fit nearly as well.
I don't know how long either kit will last, since my experience with both is less than one year.