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Wisconsin | I've never seen them around here, but then I don't work commercial construction either. Steel buildings in general are not that common in my circles.
If you look at bridges, they were built with trusses like that for decades, but now they use enclosed steel "tubes" because they're easier to paint, as far as I can tell. That's my guess of where the savings comes from, more labor but more efficient use of materials with the trusses. For a livestock building, I'd shy away from lighter trusses because of corrosion. I wouldn't have any issue with that style for a storage building that's enclosed inside, maybe not with fertilizer.
One thing I'd consider with all the work going into finishing the interior, upgrading the design loads of the frame, because the frame becomes less of the total cost the more you add to the building, and the less you want to have to do it all over after a storm.
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New metal building
