Which tire has the highest Treadwear (UTQG) in size 305/45R20

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 305/45R20?


500 - Treadwear

 Yokohama Geolandar A/T-S G012 - UTQG: 500AB - Tire Rating: 4.52


420 - Treadwear

 Kumho Ecsta STX KL12 - UTQG: 420AA - Tire Rating: 4.5


320 - Treadwear

 Yokohama Advan ST - UTQG: 320AAA - Tire Rating: 4.55