Sounds like something was wrong with your 13 Mini as this comparison is pretty laughable. The 12 Pro Max camera (which is what is in the 13 Mini) is worse than a iPhone 8? lolI would recommend against 13 Mini. I had it for a week. The only good thing about is the size.
The battery life is atrocious. 6hr screen time would drain the battery to 0%.
The camera is actually worse than my old 8. See the photos. The 13m is just unable to focus at close distances.
I returned it and picked up an 11. I get 10hr-11hr screen time per charge. The camera is good. I can turned off the HDR. Very happy with 11
Also, from my experience the 13 Mini gets far better SOT than the 11. 10hr-11hr SOT seems very unlikely for a regular 11.