UTQG numbers are supplied by the manufacturer, so they're always taken with a "grain of salt". All you can really gather from the two tires you mentioned is that the P-Zeros have a softer rubber compound than the Continentals. They are both good tires but I believe the Pirelli's are better suited to your rim widths. I recall seeing the 335/35-17 P-Zero's for $488 each, I just can't remember where. Maybe the Tire Rack will let you have them for that. Get them before the sale ends (June 4th).