I much prefer to use the Easy Angle for cutting triangles for HST. Way easier to know what measure you want because that is the size strip you use.
I think with the Nancy Notions one, you'd need to trim down the HST after you've sewn it. So if you need a 1.5" one, you sew the 1 5/8" and then trim down. I think that is why they are mostly 1/8" larger than what you'd normally use. Too me, it looks like too much work doing them that way.