assuming you'll use colorbond made by bluescope and avoiding the subjective aspects of colour preference, colour combinations, etc, i can refer you to the source of the technical info you need
have a look at the Colour Centre: Colour Centre website and look at thermatech thermal coating on the colorbond sheets.
same goes for fading questions - it's on this same site.
with that, over to you for the aesthetics and the real-life performance of this product