both exhaust will yield the same sound, the difference that people notice is due to different resonator and cats.
I have the Skunk2 muffler and it sounds very nice, is not loud by any means, but if I step on it, you know there is a car with a working engine next to you.
my setup is vibrent performance super silent resonator, magnaflow high flow cat and skunk2 muffler, all with 3 inch piping on a 3rd gen 3sgte
I would go with whichever you can get cheaper, I got my skunk2 for 25 dollars from a friend so choice was easy for me