I have had samson true duals and now have vance and hines. I like my vance and hines better. In my opinion quality wise vance and hines are better. A friend of mine has freedom performance duals. I like freedom performance there heatshield is a lot thicker. Freedom performance also offers a stepped header than according to them it makes a difference in performance who knows if that is true. I got v&h because i got a very good deal on them. There are many others out there i only commented on the ones i have seen myself.
Samson if you go with fishtails. The problem I have with V&H fishtails is that the fishtails aren't proportioned to the exhaust pipe. In other words the fishtails look too small.