Both R1 rotors will be nice. The benefit of the Premium Rotors is that they have electro-coated rotor vaning and rotor hat. This will help prevent rusting and corrosion issues down the road. But here are the actual descriptions from R1 themselves:
Product Description :
R1 Concepts PREMIUM SERIES BRAKE DISC WITH BLACK E-COATED HUB --
* Black E-Coating Gives Long Lasting Corrosion Protection
* High strength cast iron discs
* Direct Fit OEM Replacement Brake Rotor
* Double disc ground finish reduces rotor vibration
* Meet Or Exceed OEM Standards For Excellence
* Mill balanced brake rotors ensures long lasting durability
* Superior Machined Surfaces That Provide Smoother And Quieter Stops And Longer Brake Pad LifeProduct Description :
R1 Concepts ELINE BRAKE DISC -- When price is important and quality is essential. R1 Concepts ELINE Brake Rotors offer many of the benefits of an OEM part at a fraction of the cost.
* Direct Fit OEM Replacement Brake Rotor
* Double disc ground finish reduces rotor vibration
* Meet Or Exceed OEM Standards For Excellence
* Mill balanced brake rotors ensures long lasting durability
* Brake rotors are casted using G3000 graded iron.
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