I'd start with the Greens, and if you end up overheating them and observe any fading, then go to the Red's. However, the Red's take more heat before they grip well. Personally, I use older Green's on the street (reportedly the newer green's are no better than stock - don't grip any better like the old ones did, and dust just as much - so the only advantage might be in price). The Red's take more heat to grip well, and thus you may not be happy with them on the street. I have used Yellows on the track (higher temperature range than Green's or Red's), and they don't grip well until very hot - first few brake pedal applications on the way to the track require a lot of effort, and they don't grip well until a couple of really hard 70 to 0 applications.