Aerialite E-glass and Hexcel E-glass are the same materials from different manufacturers. We personally like Aerialite because it drapes over rails a little better and easier to laminate. But some guys swear by Hexcel for one reason or another. It's all personal preference as is everything in surfboard building. WARP glass has more glass strands running along the stringer direction which improves bucking and break strength. Some guys say it holds pigmented resin better too for a deeper color. S-glass is 20% stronger than E-glass as the glass is processed at a higher temperature. Great for improving overall ding resistance while keeping your board light.