So I recently went through this. I have a 2021 5.3 10 Speed Trail Boss. I previously had a 2020 RST which I installed the Borla Touring exhaust on it. I was happy with it. I installed the same exhaust system on my TB, and for some reason wasn't as happy with it. I blamed it on the 10 speed which shifts much more, and keeps the RPMs down better than the 8 speed. A co-worker put a new exhaust on his truck, and it made mine sound stock...so last month I contacted Borla and asked if I could buy the S Type Muffler. They sold it to me, and I installed it about a week ago. 15 minute job, just swap out one section. Initially I loved it, but after a couple weeks I went back to the Touring. It sounds good, but it's pretty loud outside the truck. Inside it was remarkably quiet for the noise it made outside. Really impressed with what Borla can do as far as drone. I'm happy back on the Touring system now. My motivation was I wanted it a little louder than the Touring, but the s type ended up being more than what I wanted.. I loved the sound, but I just felt for me it was too loud for my daily. I have an s type system on my C5 Corvette and LOVE IT.
On a side note, anyone with a GM Performance Cat Back or Touring that wants to upgrade to the S Type let me know. I have the muffler sitting in my garage that I need to get rid of.