It makes more sense to avoid steel entirely. In areas where the line is not at risk of mechanical abrasion, I simply stayed with PVC. Two drops out of the ceiling in my shop, where the exposed PVC is only about three inches long. Where I was concerned, I turned to copper. There's a three foot drop in my basement. Everything protected by drywall is still just PVC. I have yet to plumb the storage containers, but the delivery to them is PVC. I'll likely go to copper again. It's safe, and corrosion isn't an issue. I'm not a fan of steel lines, which eventually rust and dispense particles. That said, all of the outlets in my shop, aside from the two I mentioned, are steel. They are short in length, only about six inches long---enough to get the pipe to the surface of the wall. Each is poured in concrete (my shop is built from foam blocks, with solid grouted cells. The PVC pipe is buried in the cells, fully grouted).
Slip X thread adapters are readily available for all pipe sizes, both male and female, so going from PVC to threaded pipe isn't an issue.
While PVC is treated for ultraviolet, anywhere it's exposed to fluorescent lighting (my shop is so lighted), it's a good idea to not have it exposed.