Why compare a Rosso to a Pure and S20? Not in the same price/performance league. The Rosso is a comparable tire to the Power 2CT. Put the Pure/S20 against the Supercorsa (awesome tire)
That's a perfect comparison actually, the Supercorsa is their premium track/street tire and the Power One would be the same equivalent for Michelin. Pure and Rosso are almost identical in price as well.