I assume you mean sheet metal intended for roof pitches of 14 degrees and more. I find it hard to believe that there would be any significant difference between the one sold by ByggMax (manufactured by Areco) or, for example, Plannja's. However, there is a wide range of other types of metal sheets than the trapezoidal corrugated or tile-imitating ones that are most common in building markets. There are profiles that, in my opinion, provide a much more attractive result, which I think should be considered. Then there's metal sheet in other metals than coated galvanized steel, which therefore have a much longer lifespan.