It is worth saying plainly before anything else. Wood and composite are both decking, meaning the layer you walk on, and neither one carries the deck. What holds people up is the framing underneath, the ledger at the house, and the footings in the ground. A composite surface on a failing frame is a failing deck with a nicer floor, and it will cost you the price of that floor twice when the frame has to come out.
That matters here because the material decision usually comes up during a resurfacing conversation, when the frame is already in place and easy to ignore. So treat them as two decisions. First, does this structure have real life left in it. Second, given that, which surface suits how your deck faces the sun and how you want to spend your Saturdays. Answering them in the other order is how homeowners end up disappointed by a product that was never the problem.
Utah sun is harder on decks than most people expect. Thin air at elevation means more ultraviolet reaching the surface, dry summers mean long stretches of it without relief, and the result is that finishes break down faster here than the label on the can suggests. A wood deck is only as protected as its current coating, and once that coating fails, the wood underneath starts taking water and sun directly.
Exposure decides how fast this happens. South and west faces take the most sun and weather first, sometimes noticeably faster than the north side of the same deck. If your deck is fully exposed to the afternoon, expect a wood surface to demand attention on a shorter cycle than a shaded one. Composite handles ultraviolet better and does not need re-coating, but no material is unaffected by years of direct high-altitude sun, and color choice matters more on those exposures.
Wood moves. It takes on moisture, gives it back to dry air, and does that constantly across a Utah year. In winter, water that has worked into the grain or into cut ends freezes and expands, which opens checks and splits and gives the next round of water an easier way in. This is why cut ends and board ends are always the first places to fail, and why a deck can look fine in the field of a board and be finished at its edges.
The practical implication is that a wood deck in this climate rewards attention on a schedule and punishes neglect faster than a milder climate would. Cleaning and re-coating on a regular cycle keeps water out of the grain, and skipping cycles compounds because the damage from one winter makes the next winter worse. Composite does not soak up water the same way, which is a genuine advantage through freeze-thaw, though the framing beneath it still needs to shed water and stay dry.
The honest comparison is not maintenance versus no maintenance. Wood asks for periodic cleaning and re-coating, and there is real satisfaction in that for some homeowners and real annoyance in it for others. It is a finish you maintain, which cuts both ways. You are committing to a cycle, but you can also change the color later, sand out damage, and replace a single board so it matches the rest of the deck.
Composite asks for less, but it is not maintenance-free. It needs cleaning, it can stain, and organic debris left sitting on it in a shady spot will leave a mark. What it will not do is demand a re-coating cycle you have to schedule every few years. The tradeoff to weigh is that composite gets hot in direct sun, which is a live issue on a south or west deck at Utah elevation if anyone in your house goes outside barefoot in August.
Stand on your deck in the middle of a July afternoon and pay attention to which way you are facing and how much shade you have. That observation is worth more than any brochure. A deck that bakes from noon onward makes heat underfoot a real factor and makes finish longevity a real factor, so both materials are being pushed hard and the decision comes down to which annoyance you would rather have.
Then think about use. Barefoot kids, a dog that lies out there, and a deck used mostly in the afternoon push one direction. A shaded north-facing deck used for evening dinners takes the heat question off the table entirely and puts the choice back on maintenance appetite and how you want it to look. If a cover or pergola is anywhere in your plans, factor it in now, since shade changes the material calculation and changes the structure as well.
Composite generally holds its appearance longer without intervention, because there is no finish to fail in the sun. A well-maintained wood deck can last a long time here too, but the operative word is maintained, and Utah sun and freeze-thaw shorten the interval between cycles. The framing underneath ages on its own schedule regardless of which surface you chose.
Yes, and people do it thoughtfully. Composite on the walking surface with wood accents, or different materials on stairs and railings, is common. What matters is that fastening, spacing, and drainage details are handled correctly for each material where they meet, and that the framing supports whatever spacing the decking requires.
There is no free answer on a west-facing deck. Wood will demand a shorter re-coating cycle, and composite will get hot underfoot. Many homeowners on hard exposures end up solving it with shade instead of material, which is its own structural project. Decide which tradeoff you will actually live with, then plan around it.
New build, repair, cover, railings, or resurfacing, tell us which and we will take it from there.