Most deck decisions get made in a paint aisle, in front of a color chart, which is the wrong order. The finish type matters more than the color, because it decides what the deck will need from you in three years.
Clear and semi-transparent
These soak in and leave the grain visible. Because nothing sits on the surface as a film, nothing can peel: the finish thins where the traffic is and grays back gradually, and recoating is a wash and another coat with no stripping involved.
The trade-off is that they hide very little. A board that has weathered unevenly will still look uneven, in a nicer color.
Solid color
A solid stain or an exterior paint holds a film on the surface. It covers timber that is past looking good, it opens up any color you like, and it holds beautifully on railings, risers and posts, anything that is not walked on.
On the decking itself it is a bigger commitment than it looks. Boards flex underfoot and move with the seasons, and eventually a film lifts at an edge. Once that starts, the fix is stripping rather than recoating, and stripping a deck is a job nobody enjoys twice.
Mixing the two
Solid color on the rails and semi-transparent on the boards is a common answer and usually a good one. You get the contrast where it is seen from the garden and the easy recoating cycle where the wear actually happens.
Whatever you choose
Wash the deck and then let it dry properly. Applying a finish to damp timber is the single most common reason a deck job fails, and the drying is not a delay in the schedule. It is part of the work. Then take the time to lay the coat on in full board runs, because lap marks last exactly as long as the finish does.
If you would rather not spend a weekend on it, this is how we handle decks.
