I've been building for 40+ years. Spent 30 years building in wood, and the last 10 building mostly commercial red iron structures. I also had the exact shop you are describing- 30x 40 stick built with scissor trusses.
Since it will have to be engineered regardless, there is no structural difference. If built right, they will both handle the loads and last.
You are right about appearance. Wood framed looks better.
I loved my wood framed shop, but if I get a chance to do it again, I'll do metal. Mostly because the wood framed building never actually got finished... the shell went up, then there was always something else to do. Wire it, build a storage loft, insulate, Sheetrock, paint the exterior... it was a beautiful building, but it cost me a lot more than metal, and consumed a vast amount of time over the 20 years I owned it
Pre-engineered (red iron) is cheaper, and vastly faster. The building goes up in a week or 2, and it's ready to use. No exterior paint, no insulation. For me, I don't mind the semi-commercial appearance, and I would leave the purlins exposed inside and run wiring exposed. Doesn't bother me a bit.
If I lived in your region, I would consider SIPs. They are DIY friendly, can have prefinished panels on the exterior, and the insulation capability can't be beat. I'd run the electric in exposed conduit.
It comes down to cost and appearance and personal preference.
Metal will be your cheapest option, SIPs will probably be your most expensive option (although the labor may be free if you do it yourself). Stick built will be deceptive... it will look cheaper, but include much less. By the time you actually finish it enough to compare apples to apples (finished siding, roof, paint, insulation, overhead doors, doors windows, engineering, finished interior surfaces, labor value) it will be much more expensive.