Well, Nate--if Gernold were doing yours, then I'd let him choose.
If you are doing yours, don't attempt welding it unless you are an expert welder and have a lot of experience in fitting exhaust systems. You need to know your installation is perfect before welding, and you really need skills beyond that of a shade tree mechanic. I am assuming you are one like many of us, else you would not ask the question.
BTW, for what its worth, my SS Time Valve has been on for about 10 years, with SS clamps, and nobody has complained about the exhaust note. With the top down there is all kinds of noise, the exhaust not being one I worry about.
I suppose once you have it in and all, and if you happen to find yourself up in Maine one day (or at any of the other extremely skilled mechanics we all know about round these parts), you could have it all welded up. It will be, in all likelyhood, the last exhaust system your car ever needs.