Polyurethane gives you the best of both PVC and Rubber.
It is the lightest, most durable, and flexible of all hoses. It stays flexible in very cold weather, it is 1/3 the weight of rubber, and is much more abrasion resistant than either PVC or Rubber.
If you are running 1/4" fittings, there is zero reason to run 3/8" hose as the hose is restricted by the I.D. of the fitting. If you are using 1/4" body size quick couplers, use 1/4" hose.
If you are running a DA sander or a large impact, etc, you need to run at least 3/8" hose with 3/8" fittings and couplers or go up to 1/2" for large CFM needs.
If you are using it with nailers or staple guns, 1/4" is all you need as these use a large but short burst of air, unless you are putting up shear wall, then you need 3/8"
This comes from 30 years of selling air tools and hose.
Bob