Which tire has the highest Treadwear (UTQG) in size 255/55R20

It's time to buy new tires for my car, but I want to buy a tire that lasts longer than the original brand, OEM. Which tire has the highest Treadwear in this size 255/55R20?


740 - Treadwear

 Continental CrossContact LX20 - UTQG: 740AB - Tire Rating: 0


640 - Treadwear

 Nitto NT421Q Premier All-Season Crossover - UTQG: 640AA - Tire Rating: 0