I like the Yellowhammer because everyone in our area seems to be stuck on the cottontail squeal - and the coyotes have learned to stay away or hang up at 400-500 yards when they hear it. The coyotes here respond better to something different.
Also works well on fox and coon. Not sure why the coons like it, but they do come running. Maybe because the rivers are frozen over and Yellowhammers taste like clams, lol?