Extra question: how common is it to have a cat with diabetes and pancreatitis? I know the two are linked, but I'm wondering, with regard to protocols, if the fact that a cat has pancreatitis should make one choose one option over an other. Are there many people doing TR or SLGS when the newly diagnosed cat also has bad pancreatitis?
Someone corrected me on this one and it's good to know the distinction. TR is a protocol, there is science behind it and a study was involved. SLGS is a method that was developed here, it is built with safety in mind but has a lot more leeway and flexibility, well, because it isn't a protocol.
I can't answer your question re: pancreatitis, but I think choosing which strategy is more a matter of what works best for the human involved and less of what's going on with the cat. They both aim to regulate diabetes and go about getting there in slightly different way.
I can share with you how I chose. I liked that TR had the science to back it up, that appealed to me and I didn't have to trust this random group of people I didn't know with "this is what we do and it works for a lot of us". Fast forward to I now very much trust these random people on anything diabetes over my vet!

Also, early on, I wanted my vets approval and them to be on board with what I was doing since they were supposed to know best and held the rx pad to give my cat insulin. I felt it was an easier sell with TR since it's published in a peer review journal. Lastly, the TR remission rate percentages, I felt Asia had much better odds to have a remission on this protocol. The aggressiveness of it scared me, and still does, that made SLGS more appealing, but the tipping point for me was trying for remission. Asia is old and probably doesn't have as much time as some other cats here, so I felt start low and go slow wasn't going to do her any favors to feel better quickly enough. I'm not suggesting you choose TR, I just wanted to share what things I considered with making my choice.