Which tire has the highest Treadwear (UTQG) in size 255/50R17

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 255/50R17?

---

420 - Treadwear

 Marshal Matrac STX KL12 - UTQG: 420AA - Tire Rating: 4.66

---

400 - Treadwear

 Pirelli Scorpion Zero - UTQG: 400AA - Tire Rating: 3.53

---

320 - Treadwear

 Nitto NT555 G2 Summer Ultra High Performance Tire - UTQG: 320AAA - Tire Rating: 0

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

---

300 - Treadwear

 Nitto NT555 Summer Ultra High Performance - UTQG: 300AA - Tire Rating: 4.13

---

260 - Treadwear

 Nitto Invo Luxury Sport Ultra High Performance Tire - UTQG: 260AAA - Tire Rating: 0

---