There are some 1500 yeast strains. Therefore there's a lot of research and note taking concernig the best Yeast for specific uses like brewing and wine-making. Lalvin yeasts are designed to please the brewer by offering certain characteristics that enhance a diversity of wines and ale styles. Therefore, yeast is not just Yeast, it is finely adjusted and formulated for special uses. Tip: use the appropriate yeast for the purpose required, by reading the text on each packet or look at the various web site descriptions for the best uses of each type of yeast.