What kind of dumb question is this.....?
What determines quality? Longevity? Treadwear? Compound? Some weird mix of all three?
Tires like the Hoosier a6 aren't really road-legal, but they're excellent.
If you REALLY want to find the best street tires, look at what the Street Tire classes are running in autocross (Hankook RS-3, Dunlop Star Spec Z1, Nitto NT-05, etc)
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