I prefer a rattle bag. Mostly because it is easier to carry out and handle. The rattle back from Knight and Hale is the one I use and I have rattled in about 5 or 6 bucks between this year and last. They claim to 'engineer' the 'blocks' in the rattle back to give a very accurate rattle soundof real antlers. But opinions are like A$$ holes, everyone has one.