What are the relative advantages and disadvantages of "normal" modern
fabric coverings (doped and painted polyfiber) vs. the stitched,
zippered sailcloth coverings (dacron, others?) on many ultralights and
new LSA airplanes? How are the sailcloth coverings attached?

The Aventura 2-place homebuilt I saw at Oshkosh had dacron wing covering
that looked for all the world like it was held on largely by tension.