ribbot
I've used both---meaning the cheap apple juice with 10% juice and I've used apple cider (not organic) from the orchard in my neighborhood. I didn't notice any difference with the stones using either. I did, however, really enjoy the Mott's 100% apple juice in the gallon container at walmart for $4 Had a great flavor!
Why not just eat apples instead? They're probably a lot cheaper and more fulfilling than juice anyway. Remember the saying about the apple and the Dr....