Such a tricky question. They all sound good. If you want really loud go atak. If you think it could be anice issue. The stype sounds great add well. We have both and the corsa available if you need help
I have no comparison but I have the S type catback on my GT, which is my first Mustang and I absolutely love them. I've always had a huge crush on the sound of Mustang since a child and that sound is exactly what I wanted from mine.
The best way to describe it is, idle, low rpm revs it has a nice low-tone, growl. When the engine decelerates it has gurgles and slight pops. Somewhat reminds me of the Bassani sound on the older Mustangs. When cruising it produces a low, aggressive V8 growl. Once you start to rev past 4kRPM it becomes more of a raspy, race induced sound.
Cruising on the highway @ 78MPH the car produces a slight tone that can be heard inside the cabin but nothing that would prevent a conversation and absolutely no droning. If you are controlling the speed using a pedal and keeping it constant, the exhaust sound literally disappears.
Downshifts and higher RPM engine braking will definitely get you noticed in a good way. All around the exhaust sounds really nice and I am happy it's the route I went. My other choice was Corsa or Kooks by researching videos. I did hear the Corsa extreme in person and while it sounded extremely beastly, it was TOO loud.
I think the S type is the suitable DD exhaust that provides you will an aggressive sound when you want it.