Deck stain offers UV protection due to the pigment it contains. The darker the stain, the better the deck stain protects your deck. There is a wide array of stains. Getting the right opacity depends on the surface you are staining and your taste. Staining a deck is more expensive than sealing it. The stain itself is more expensive, and it makes sense to invest in hiring a deck contractor to apply the stain as application can be a bit tricky. However, staining a deck protects it from both moisture and UV rays. Deck stain lasts longer than deck sealant.