I prefer Wonder Under (Pellon 805) or Mistyfuse because: both can be tack fused for easy repositioning, both are easy to sew through multiple layers by hand or machine, both are easy to find, both leave needles completely 'gum free', both can be purchased in small amounts or by the bolt, and Wonder Under can be run through an ink jet printer to print patterns directly on the release paper (Mistyfuse is paperless). Mistyfuse is lighter weight and does not change the hand of the fabric. It can also be used on sheers quite nicely.