I have done some testing with the 14 PM vs 15 PM and these are some of my observations -
15 PM seems to be smoother graphics-wise; 14 PM stutters sometimes such as when an app flies into the dynamic island & scrolling does seem smoother at times on the 15, as if it’s able to maintain a higher frame rate.
The change in weight is nice & I use a MagSafe wallet. Most of the weight shifts to the base of the phone with the wallet on and it feels like the phone is less likely to tumble forward out of my hand, if that makes sense. Curved edges also feel nice in the hand.
Speaker sounds more “tin” like on the 15 PM. The 14 PM sounds fuller at the same volume. Maybe this is due to the new titanium frame?
I noticed that apps sometimes stayed in memory for a longer time with 8 GB of RAM, but it wasn’t a significant difference as apps had to load from scratch maybe 20% less of the time vs the 14 PM.
Battery was about the same between both phones and I didn’t appreciate any significant difference in raw percentage lost over similar usage. My 14 PM battery health is at 91% so it would be nice to get that back up to 100% with a battery replacement if need be.
Cameras are exactly the same and the 5X telephoto is kind of a letdown. I use the telephoto rarely, but I do personally prefer the 3X lens on the 14 PM because I don’t zoom in that much anyway and would prefer to not have a 1x crop all the way out to 120 mm.
The issue for me is the display on the 15 Pro Max. It does appear more yellow than the 14 PM and it seems there is less contrast; there is also significant color shift to green along the bottom ~1 inch of the display when I tilt the top of the phone toward me by ~5 degrees. Side by side under a bright white light at 6500K with the TrueDepth system about an inch away, the 14 Pro Max clearly hits a higher peak brightness throughout the screen and seems more color accurate in terms of True Tone and matching the color of the ambient light. On the first day of having this new phone, I noticed that the 15 PM was noticeably harder to read in bright light outdoors and instinctively went to increase the brightness, but it was already at 100%. I believe this is a hardware issue and not something that can be fixed with software.
Here are some other posts of people noticing issues with their displays:
https://forums.macrumors.com/threads/14-pm-not-as-yellow-as-15-pm.2404027/
https://forums.macrumors.com/threads/true-tone-too-strong.2404699/
I wanted to love this new phone with USB-C and the natural titanium finish/camera setup on the back is gorgeous, but I can’t compromise on the display and I don’t want to jump down the rabbit hole of constantly buying new iPhones to test out displays when I already have a good looking display now. The two-week return period means waiting for Apple to potentially patch the display with software (if it is possible or ever happens) is likely not feasible. Everything else between both phones is essentially similar, so I will be taking my 15 PM back later this week and buying out my 14 PM on the iPhone Upgrade Program.
This was a lengthy post but hopefully some people find it helpful, especially those who have similar display issues with the 15 PM and aren’t sure if they want to return or keep it.