To answer one of your questions I would highly recommend composite decking attached with stainless steel fasteners. This will be the lowest maintenance for you and eliminate regular staining, splinters, etc. Several types have a embossed wood grain with them that make them look more like real wood and the raised grain makes them non slip. The product I have used on my dock and several decks is Evergrain. It has low expansion/contraction and has held up well to our Northwest weather. A nice way to attach this is with stainless steel screws called Headcoat. They have a painted head to match the material and when drilled correctly sit nice and flush. The lack of maintenance alone will pay for he increased cost of the material.
1999 Prostar 205 with 330 HP LTR