For me the best is regular cotton balls. Yeah sheets/pads are a little easier to work with, but at 10x the price not worth it. Fact is once in the atty and primed, I can't tell the difference between 1 brand/type and the next.. Yeah I have to boil my balls, but them I boil fancy vaping pads also. Not because it needs it, like bleached cotton, but because I think boiled cotton performs better than unboiled cotton. To me, Cotton is cotton.