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I'd like to see (another) comparison done. Take a moderate bike, maybe with the eq of a stage 2, and try the different 2-1's. They all sound good. I like the TH, but it's what I have. If I had a bagger, pretty sure it would be the Fatcat.
I've got a ProPipe that my wife said was too loud. Replaced with R True Duals. Fit my 05 RK. Lemme know if ya want to try it out (if it fits yours, of course).
My $0.02 worth, I like RB Racing LSR 2-1 pipes. I just installed a set and the dyno numbers were good, Max HP 77.4, Max TQ 88.5. I find the sound pretty mild overall. They are certainly louder than my OEM with slip-ons, but not unbearably loud like short drag pipes can get. They've got a nice throaty rumble to them. But, mostly I like them because they make HP and TQ.