There's not that much difference in the front application, will mostly depend on rotor size. For the rear application the significant difference will be what material the hat is made out of, iron or aluminum. The rear hats are often iron for e-brake durability.
While weight savings is a nice thing, especially unsprung weight, make sure you get one that can take the track abuse. If you're not tracking then unsprung really doesn't mean much.
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