For those seeing plywood prices climb thru the roof (and who isn't) for a host of reasons I'll not start unpacking here - gets political quickly, but its also COVID for complicated reasons - I recommend considering Hardiepanels. Heavier - they are 4x8 sheets of essentially concrete and fiberglass - harder on your tools and you definitely want to use a dust mask when cutting them (NOT! with your favorite circular saw blade), but they are superior to wood in almost every respect. In normal times, a Hardieboard panel runs $35 near me, while 1/2" exterior Ply runs $28. Hardie is now $42 as of last week, but the Ply just hit $65. Makes it MUCH easier to justify the extra wear on saw blades and the heavier material haul to the job site.
Same dynamics going on with metal roofing right now. Requires less framing, no decking, and shingle prices have also climbed. Suddenly, a product that used to cost more (and is still less attractive) has a very nice cost advantage over traditional construction.