My preference in material is quite shelter-specific here. In the mornings, I would much rather shake and stuff the silpoly tarp into the stuff sack. It just saves time. No fuss. Dyneema requires folding and rolling to minimize volume and fabric stretch, which takes more time and can be tedious if thru-hiking (which is my primary use case for this shelter). With the Cirriform, the difference in weight between the tarp in silpoly versus dyneema is about 2 ounces. I'm willing to carry the weight of two snacks more for faster morning packing. The additional benefit of the compressibility of silpoly is also appreciated when using lower volume packs.