There is a persistent idea that solid wood is the premium material and plywood is what you use when the budget runs out. In a working shop, that is not how the decision gets made.
What solid wood does best
Solid lumber can be shaped, carved, profiled and repaired. You can sand through a scratch and refinish it many times over a lifetime. Edges can be rounded, chamfered or moulded without exposing anything. For legs, rails, face frames, door stiles, mouldings and anything with a shaped edge, solid wood is the only sensible answer.
Its weakness is dimensional. A wide solid panel wants to cup, twist and change width with the seasons. Fighting that across a large flat surface is a losing battle.
What plywood does best
Quality cabinet plywood is a stack of thin veneers with the grain rotated at each layer. That cross-lamination is what makes it stable: the layers restrain each other, so the panel stays flat and barely changes dimension. For cabinet sides, backs, shelves, drawer bottoms and large flat surfaces, it outperforms solid wood outright.
Its weakness is edges. Exposed plies need banding or a solid edge, and you cannot shape a profile into it without cutting through the face veneer.
The combination is the actual answer
Look closely at good furniture and you will usually find both. A plywood carcass with solid wood face frames and doors. A plywood table top with a solid wood edge and solid legs. Plywood drawer boxes with solid fronts. Each material doing the job it is genuinely better at.
Not all plywood is the same
This matters more than the plywood-versus-solid question. Construction-grade sheathing and cabinet-grade hardwood plywood are different products. Cabinet grade has more plies, fewer voids, a proper hardwood face veneer and a flat, consistent surface. Using the wrong one is where plywood earns its bad reputation.
Ask about the parts you cannot see
When you get a quote for custom cabinetry, ask what the boxes are made from and what the drawer bottoms are. That is where corners get cut, and it is invisible until a drawer bottom bows under a stack of plates.
