Which tire has the highest Treadwear (UTQG) in size 185/60R13

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 185/60R13?

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680 - Treadwear

 Kumho Solus KR21 - UTQG: 680AB - Tire Rating: 4.5

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400 - Treadwear

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

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340 - Treadwear

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

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320 - Treadwear

 Kumho Ecsta SPT KU31 - UTQG: 320AAA - Tire Rating: 4.17

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