They are very different tires (Pirelli vs Dunlop). I know the DS-1 and 210 Snowsports well. The Pirelli perform just as good as a good A/S tire, much stiffer sidewall and all, BUT they are so-so in wet snow condition (like the snow in spring or when they put salt afer a big snowfall). They are great for ice, packed dry snow and incredible on the dry, but not as safe as Dunlop. Those Graspic are great everywhere except on the dry (alphalt).
So it depends where you live and where you drive. I heard that Michelin X-Ice are great tires, possibly a good compromise btw those 2...