They solve different problems. Knowing which one fits your situation helps you ask better questions.
Veneers and crowns are sometimes confused, but they address different needs. A veneer is a thin facing bonded to the front of a tooth, mainly for appearance.
A crown covers more of the tooth and is often used where a tooth needs more structural support.
The right option depends on the condition of the tooth and your goals. A clinician should explain how much natural tooth is involved in each approach.