Red has no deep cycle it's just built solely on starting and keeping your vehicle going, yellow most offroad guys use when the have more accessories like a winch, lights stuff like that, yellow is a blend between the red and blue, yellow has the cranking amps of red and the deep cycle of blue, blue is for the marine guy but you can see it in alot of jeeps that run a large amount of accessories for example electric lockers, air compressors, winch, multiple amounts of offroad lights, interior doo dads, and all kinds of other good stuff, so if you arent running accessories buy the red top, another benefit to all the optima battery's they all are spill proof, and vibration resistant which also gives them longer life. I bought the blue top. Great battery.