I know the red top is better for short bursts of power like starting or winching and the yellow is better for long steady draws, like a powerful stereo or bright lights. I have all of the above and will eventually have a welder also. I am thinking of putting in a big ass alternator. Is the deep cycle yellow top really worth the extra $50? Or will the alternator take care of the lights and stereo without any problems? That's because I'm the devil.