They both work very well.FogZero is fast and easy to apply in the field, but from my limited testing, they seem to work about the same preventing on the oculars of bino's. Just remember, this isn't the same as the hydro coatings used by makers such as Bushnell, Zeiss, Leica, Steiner and Meopta that repels water/snow from sticking to the lens and provides an extra layer of durability as well. This stuff just helps (quite a bit) prevent fogging from either breathing on a lens or from your skin/face temperature causing fog to accumulate.
Glad that stuff helped out JG. The other stuff that you tried, like Parkers, leaves a slight film behind that is visible, and I'm sure that doesn't help the view through bino's especially. Perhaps you might not see it as much through a scope, but why bother when you have newer products that don't leave a visible film. Same goes for those anti-fog cloth wipes. They too leave behind a film.
