Depending on your needs you could probably do one or the other and get a great looking, long lasting shine.
I think what you use and how much comes down to the look you're after. I prefer the look of the 845 on my dark colored cars as it provides a deep, warm, glossy look I don't get with the Klasse Twins. The Twins however, look great on lighter colored, heavily metallic paint due to the incredible shine they create.
I've never layered three coats of SG to see what that looks like, but I have done two plus a coating of Sonus Glanz (which is supposedly made from SG) and not seen any real change in the appearance. I've been perfectly happy with one or two coats. One coat easily lasts 6 months under most conditions.
Right now I'm running a head-to-head test of the 845 and the SG to see how they hold up this winter.
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