the masterminds are going to have more flex, i believe, because of they're cap construction. they are also going to be lighter than the silencers.
the silencers have sidwall construction so they are going to have better edge durability and stiffer. the silenceers also have all mountain rocker so they are going to float WAY better in the soft snow.
so if you want a ski where you are mostly in the park, i would go masterminds.
but if you want somthing that will actually float in soft stuff, i would go silencers.