Cost

• If cost is a major factor for you, choose pressure-treated pine. Pressure-treated wood is readily available and generally costs half as much as cedar. Pressure-treated wood is available in several grades at different price points. Pine labeled "choice" or "select" costs more, but the wood has fewer knots and blemishes and is less likely to warp.
  
  

Appearance

• If you are not planning to paint your deck or fencing, you might prefer cedar. Cedar has a distinct look and color and becomes more attractive as it ages, particularly heartwood. Cedar does need to be sealed on a regular basis, however, to maintain that natural beauty.
  
  

Durability

• Cedar heartwood is decay- and insect-resistant, and holds up well to the elements, however, it does not offer the same longevity as pressure-treated wood. Some professionals recommend using cedar for deck and fencing rails, but pressure-treated pine for deck flooring and fence posts. Cedar is soft wood that is known to decay below ground. Pressure-treated wood holds up to wet soil for decades. Additionally, pressure-treated wood handles foot traffic better than cedar, although it can warp and crack over time. Cedar is less likely to warp, but cedar floorboards and steps may sag with heavy use.
  
  

Maintenance

• Wood that is exposed to the weather requires regular maintenance in terms of cleaning, sealing or staining. Both pressure-treated wood and cedar require similar care, but cedar is chosen more often than pressure-treated wood for aesthetic reasons. If you choose cedar, too, be aware that it needs to be cleaned and resealed on a more frequent basis than pine in order to retain its warm natural appearance.