There's about as many opinions on this subject as oil. Several factors that don't get reported on these threads are; Height of windshield, type of exhaust
and others. There are lots of ways to claim power in a system, and many are not at all accurate. I'm not an audiophile but I like clear sound at highway speed. I have heard bikes with badly distorted sound, but the owners think id good because it's loud. Hog Tunes are a quality product, with good reports on customer support. Their website, has good information. Hog Wired is another popular mcy. brand, with good support. J&M is a big player in the mcy. field, but I've read that customer support is not too good.
ADD: I have valued Dr. Doolittles posts on sound as said in his above post. He doesn't try to compare mcy. sound with home sound or cage quality.