It depends upon your budget and what you are looking for. Diamond plate is nice but costs more than plywood.
I built a couple of pontoon boats from scratch and I used regular 3/4 plywood for the deck. I didn't go with PT because I was afraid of curling and I didn't want the additional weight.
Before I installed the plywood I put two coats of porch floor paint on each side and all of the edges. I do not see any problems so far, and like a snowmobile trailer the bottom is exposed to the air so the wood will dry out easily.
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