Fair question and I'm happy to answer.What improvements from the 12 to the 13 are going to allow you to be “more creative”?
The 13 and 13 Mini have bigger light sensor for better low light photography, sensor shift optical image stabilization from the Max 12, the ultrawide lens promises more detail in the darker areas of images and twice the storage capacity… Ok, are all nice but the big one for me:
Cinematic mode
https://www.engadget.com/iphone-13-cinematic-mode-rack-focus-181710157.html
Yes!, Yes! Yes!
The 13 Pro adds faster lenses, additional enhancements to night, portrait and low light photography and an improved telephoto lens.
I do everything one-handed. For that reason, I will never, ever own a Max again. I've an 11 Pro now and, though it's manageable, I'd like it to be smaller — but only if it does everything I want. My decision will be made on the smaller size of the 13 Mini vs the telephoto lens on the 13 Pro. Stores will have them soon enough and I can decide by then.
The $300 price difference is not a factor for me. If it were, the 13 would be in the running which it's not — if I go that size, it will be to the Pro. Once I became handicapped a dozen years ago, cost went off the table as a determining factor. If I figure out I need something to make my life more enjoyable, I'll find a way to afford it. Photography is something I can still do while there are so many other activities that are now off the table. If all I needed was a phone, I'd have an SE.