Which tire has the highest Treadwear (UTQG) in size 255/50R18

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 255/50R18?


420 - Treadwear

 Nankang SP-7 - UTQG: 420AAA - Tire Rating: 4.31

 Nitto NT420S All-Season Tire - UTQG: 420AA - Tire Rating: 0

 Toyo Proxes ST 2 - UTQG: 420AA - Tire Rating: 4.43