IMHO the baddest V-Twin is clearly the V2K.
I owned one before my Rocket, and there is no other bike that accelerates with such authority while you can still count those single power pulses. Each explosion will push you a few meters to the horizon. Torque was very good, and rwhp over 100 with that Vance & Hines exhaust. In terms of sound it was equal to any Harley.
So, all in all the V2K really delivered. Most people have never sat on it, so they don't know.