I've never tried Best Press I do the 1 to 1 ratio of Sta-Flo I never get build up on my iron but that might be due to I'm a beginner & can't whip up quilts to fast yet BUT I did decide to give it a try due to everyone saying how good it smells, I bought a gallon on sale I can't remember where but it should be here anyday. I'm looking forward to it. (I don't like to drive anymore so mostly mail order)