Fresh yeast does not have advantages over dried or instant yeast, according to the San Francisco Baking Institute. Each type of yeast performs equally well when used correctly.
Fresh yeast, also known as cake yeast or wet yeast, has a short shelf life and requires constant refrigeration. Dried yeast, also known as active dry yeast, is dehydrated fresh yeast. It has a longer shelf life than fresh yeast because it has a lower moisture content. Instant yeast is a type of dried yeast that works approximately 50 percent more quickly than active dry yeast, according to Red Star Yeast. The shelf life of unopened packages of both dried and instant yeast is about two years.