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Maybe I shouldn't muddy the water for you, only hearing the Mistral. They were on the bike when I bought my 2010 V7cc. I loved the sound, drove it this way for years, then out of curiosity removed the DB Killers and never put them back, it now sounds even better. Low, mean rumble. But not loud, if that makes sense.
I have Mistrals on my 2012 and know others with Arrow's on other bikes. I like the sound of the Mistral w/o the DB killers. Nice deep rumble at idle and a fantastic growl at elevated RPM's under load. The Arrow's were not to my liking as they sounded stockish. YMMV.
No experience with the Lafronconis, but I put Mistrals on my '13 Special. The Mistrals sound much deeper and slightly louder than stock with the baffles in, and too loud for my tastes with them removed. I think they look good and they are relatively inexpensive so they might be a good choice for you. If you run them open you probably need to address the fueling as well.
Same experience here: way too load without baffles and the bike ran like crap. (even with the baffles installed) I've put my stock pipes back on until GuzziDiag has a map for the V7 ECU.... there are some incredibly loud horns out there.
:1: on the Agos. Fueling is still fine, and there is no greater sound. Worth the scratch.