Is there a taste difference between the three or four commercial brands of yeasts available at local supermarkets. My local supermarket carries only one or two different brands of yeast at a time and keeps switching off and on among the three or four top brands. My sister in law (a wonderful baker) swears that she can tell the difference when she makes her signature parker house rolls. She doesn't like Red Star. So it got me to thinking that among the many bakers here there might be some who have had experience with this.