Wood and wood veneer
Real timber, in the framed styles — shaker, recessed panel, raised panel and the glass-insert frames. Grain shows through the finish, so no two doors are quite identical, and a stain reads with depth in a way paint cannot imitate. It is what you want if the room is meant to feel traditional, or if you like wood.
It is also the material that takes carving, which is why the most detailed raised-panel profiles are only available here. Wood moves a little with the seasons; in a kitchen that is normal and invisible, and it is the reason a solid door outlives the house it was installed in.

Thermoplastic
A molded surface fused over an engineered core, and the honest answer to why so many modern kitchens are not solid wood. It takes color absolutely evenly — a true flat white, a high gloss, a matte with no grain reading through it — and it does not move with humidity at all.
It wipes clean, which matters more than it sounds on a door beside a range, and it costs less than the equivalent in timber. What it will not do is look like wood close up. If the kitchen is meant to read modern rather than traditional, that is not a loss.
