I'm going with the stick-on closed-cell neoprene stuff, about 1/4" thick. But my roof will rarely see 100F.
The bubblewrap stuff is OK insulation, but you probably are rightly concerned about its ability to withstand high temps. It's not as good as fiberglass. The smaller the airspaces, the better the insulation value for the same thickness. Not familiar with gray fleece, but it would probably work.
Sound deadening works best with heavier material. Lighter stuff like fiberglass or bubblewrap is not nearly as good as a heavier material like closed sell neoprene for sound deadening.
