The biggest reason is that Menards probably has one truss design for the building of your dimensions, and they are not customized to the building and location, rather they just look up in a table and it tells them the maximum spacing for a "Menards" truss. So whether the walls are stick built (garage) or poles, you need the same truss spacing for the snow loads in your area. And since your truss spacing is so close, the difference in vertical lumber (3 pieces per pole or spacing every 16" for stick built) probably is not saving any lumber.
On a pole barn you would span 2x4s horizontally for the metal sheating support, but you mentioned sheathing on the garage with OSB, so probably a wash there.
You mentioned you want a shingled roof, so decking and shingles so the roof is basically the same cost (Metal roof would probably be alot cheaper and the biggest cost differential between a normal metal roof pole barn and a shingle roof "garage")
However if you go to a pole barn manufacture, and specify that you want them to be conservative on the snow load, they would most likely custom design the trusses (and spacing) for your application and location and optimize the design further, which would probably save material, but they might charge more for the design than the generic menards version.
In theory if you wanted 20' spacing on the poles, it can still hold the snow load, IF the trusses are specifically design and engineered for your area and the proper snow load. 20' may not be the most efficient or cheapest either but it can be done.
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