I can speak for the Marine Plywood, having used it a few times in custom sailboat interiors during my years in Annapolis. The stuff will hold up for many many years of getting wet, drying out, getting wet, drying out, etc. If I ever do my frame-up resto on an older A/S, I'll use Marine Plywood. The treated should also work very well, but I have no experience with it.
Joe
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