Well Pump Setup: Best Materials to Use for Pipes
Subject to being a matter of opinion, but for contrast:

Pump, 200PSI black poly water pipe, pitless adapter (freezing climate, exit well casing below ground) 160PSI black poly waterpipe, house, filter, pressure tank. Plain poly, not pex. No fancy upcharge brand, just basic well poly marked NSF-PW (National Sanitation Foundation Potable Water, as far as I recall.) This is the bog standard well pipe used in every place in the Northeastern USA that I've had dealings with a well. The 200PSI stuff is because the well is 300 ft deep and the pressure down there is somewhat higher to lift the water to the surface, so 160 would be dubious. It's also sturdier for hanging the pump on.

Steel pipe? What year is it, 1949? PVC - stuff shatters much too easily for outside use, even before sun exposure.