I have used the 505 with success but haven't tried Dritz. In a recent quilting class, the instructor recommended Sulky KK2000 because it is non-toxic to humans and the environment. It calls for a very light misting which is a good thing because a small can cost $16 at the LQS where I took the class. I don't know if it can be purchased elsewhere for less. By the way, the instructor also told us to always spray the batting rather than the fabric to prevent any spotting on the fabric. That's my 2 bits' worth for the day.