I've used both and been unsuccessful with both at times. Because of convenience, I use a rattle bag and it has been rather successful at times.
I feel the louder the better. Smack that thing against the tree...it will carry far enough. I can't get rattling antlers to go as loud as my rattle bag when I bang it against the tree and scrape the bark. I suppose if I had a set of 70" horns in my hand it might make it easier too! /forum/images/%%GRAEMLIN_URL%%/grin.gif
Bottom line is there has to be bucks in the area, and if they're in the area, they have to be interested...more often than not, nothing comes in...but in the case this year, it was a little different and it was very rewarding.