Rodger,
I am not personally a big fan of Pirelli tires that are sold in the USA. I purchased Pirelli's for 2 vehicles I owned in the past, and the tire wear was terrible and the warranty was worthless.
I have had Pirelli tires on several vehicles I owned while living in Europe and they were excellent tires. I believe the European tire standards were more stringent and there were more top quality competitive brands. I think Pirelli was selling cheaper tires here in the USA by capitalizing on their European reputation.
In the USA, there is a much wider range of tire quality and prices...you can pay a premium price for crappy tires, or you can pay a highly discounted price for crappy tires. Places like Discount Tire do not often get the best quality tires...therefore they can give a bigger discount.
I have had great quality and service from Goodyear (purchased at Goodyear tire center), Michelin, and the Hankook tires that are OEM on my last 2 Hyundai Tucson's (not sure if they make SUV/Truck tires?)
...Rich