I have experience with both Power Duals / CFR combo, and Dresser Dual / CFR Combo. Installed two sets on two 2009 FLTRSE3's both tuned with SERT, same guy tuning...
The Power Duals made +3hp and dead even on Torque. The Power Duals "Smooth" out the sound, the Dresser Duals have more "Thump" because of the independent pipes. I liked the sound of the Power Duals, my buddy prefered the thump.
Honestly, no discernable difference. Both fit & finish were excellent on both pipes.
CFR's sound incredible no matter what you put them on.