Folks just love EDCO copper foil. Made of "dead soft" copper, it is just as the name implies, soft! This softness makes it easy to work with. It offers little resistance to being shaped and it bends easily. Our customers have told us that it conforms easily to the glass, and adheres very well.
EDCO has been in business even longer than we have -- since 1954 -- so we figure they must be doing something right.
Wondering when you might use silver or black backed? Use silver backed or black backed when you are working with clear or very transparent glass, and you plan to have the solder on your final product be either silver or black, respectively. With very transparent glass, the back side of the foil will be visible through the glass, so you'll want it to match the exposed side of the foil (silver or black).