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I have run both ways on track days and generally prefer the same pads front and rear. Exceptions are when running 255 square R-comp tires, the extra grip up front really moves brake bias forward so running a pad with more bite on the rear restores some of the braking balance. Tires and brake pads work together as a team so never consider one without the other. The more grip your tires have, the higher temp rating you need in your brake pad. Cup car teams will often use temp paint on their calipers to determine how much heat they have to manage. On street tires, 600F is probably plenty but as grip levels rise, so should your brake pad temp rating.