Sound Anchor adds their own filler to their stands. I have owned both Sound Anchor and Skylan although not at the same time and with different speakers so I can't give you a fair comparison. The Sound Anchors are heavier-duty and cost more than the Skylan. If you are going with the Audionote speakers, what does the manufacturer recommend for them?
http://www.soundanchors.com/page3.html
http://www.soundanchors.com/page3.html