Compare Materials for the Frame, Not Just the Deck Boards
Pressure-treated lumber is a standard framing option. It gives us a way to lay out the beams, joists, blocking and stair support for the proposed deck. The details still matter: connections, cut ends, flashing and the path water takes around the structure belong in the plan. We should name the actual lumber and components in the estimate instead of calling the frame simply "wood."
Steel and aluminum are also available framing options. Neither is a last-minute swap for a wood frame. Each needs compatible connections and a layout that accounts for the chosen boards, stairs and railing. If one interests you, we'll compare it while the deck is being designed and show where that system belongs in the proposal.
PWT is another listed wood-based framing option. We'll compare it with the other approaches against the deck's dimensions, site and surface rather than call one material the best choice for every home. A border, an unusual board direction or an underdeck drainage path may require changes to the support plan regardless of the frame material.