Which tire has the highest Treadwear (UTQG) in size 175/50R15

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 175/50R15?


400 - Treadwear

 Kumho Solus KH17 - UTQG: 400AA - Tire Rating: 4.16


340 - Treadwear

 Kumho Solus KH15 - UTQG: 340AAA - Tire Rating: 4.18