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They are just for different applications really. In my opinion, the red top is a great battery for dependable every day high CCA starting duties. It is strong and would be better than OEM for dealing with current draw from running your stereo wothout the engine running. It is great for an average X5 owner. The yellow top is more suited for heavy duty current draw and many cycles of deep discharging/charging, it has loads of reserve time. It is also great for dual or triple battery setups for guys that have gigantic AV systems. So yellow would play longer at a camp site before it discharged. The blue tops are sort of a combination of the red and yellow so I have heard, i.e. they have the long reserve of yellow deep cycle bat's and maintain higher CCA like red top's. I think you would be fine with yellow or red. Yellow is what you see in most big audio setup's if that matters.
In summary (a quote I found in google)
Red-starting batteries, hich cca, lower reserve minute.
Yellow-popular "car audio" battery, longer reserve minutes, little less cca.
Blue-longer resrve minute(comparable to yellow top) and higher CCA (compared to red tops), best of both worlds.
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