I have an interstate because I got it when I bought my car and working for a dealer of interstate helps, and when I put the battery in the trunk, I warrantied it out for a size 34 which is the biggest and most powerfull battery besides the disel and marine apps, but if I were to actually buy one I would get an Optima. Regular wet cell batteries don't take discharge and recharge too well. They also loose thier charge over time and corrode.
Red is standard, Yellow is heavy duty, and blue I thought was the Marine battery and is deep cycle, correct me if I am wrong.