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Aside from whether this is inside or outside and how finished a look you want----Frankly, if this isn't a large area, I'd be tempted to use screws and plugs. If someone sits down between supports, there might be enough flex in the wood to start popping nails. Obviously, for a seating area you'd want finish nails sunk below the surface. Finish nails from an air nailer really aren't that strong.
I also agree with the screw idea. But with a twist, depending on your available tools. If you do not have a plug cutter and do not wish to buy ready cut plugs----you could use finish screws---available at hardware stores and probably other places---I know Ace has them.
The hole would need to be filled to keep the screw head from rusting, but a dab of silicon will easily do that.
Otherwise, a 15 gauge nail has the most holding power in a nailer----but a narrow crown stapler has more holding power than the nails.