Please, help me decide to keep it or not!

I took some pictures to compare both screens, iPhone 12 PM (bigger) and iPhone X. To my eyes I can see the iPhone 12 Pro Max looks warmer than my iPhone X. But to my DSLR there is no so much difference. Bothe phone with TT off, auto-brightness off, screen brightness at 50%.
Information about my 2nd iPhone 12 pro max
Serial number:
G0NDT******
Colour:
Pacific Blue
Production year:
2020
Production week:
49 (December)
Other issues:
- under 20% screen brightness, black areas when playing videos are lighted in the screen, not completely black (off pixels) as my iPhone X
- Camera shadows issues. See the problem here: