Moving from a 1TB 14 Pro Max to a 1TB 15 Pro Max, I find the 15 to be more of an improvement than I was really expecting.
1) my 15 is running significantly cooler than my 14 was, in all situations. Really noticeable during a lengthy phone call with the phone up to my ear.
2) Apple CarPlay now starts up near-immediately, where with the 14 there were sometimes delays in making the connection. It‘s possible that is more of an “ios17” change.
3) the camera is more of an improvement than I was expecting. I don’t know if this is a “lenses” thing or a “software processing” thing, but for the first time I’ve been able to make Portrait Mode shots of things like leaves and flowers with non-cartoonish results. I really like the new “leveling” function and the increased optical zoom capability.
4) battery seems to be running down less quickly on the 15. I’ve used AllTrails once with the new phone so far and it’s not hitting the battery as hard as I always saw with the 14.
There is one thing Apple is doing that may disappoint/annoy/enrage some users who were looking forward to the faster transfer speeds on the 15 Pro models: the Apple-branded 1 meter USB-C “charge cables” that the Apple Stores are selling for $20 are only rated for USB 2 speeds. The USB 2 speed *is* disclosed in teeny tiny print on a sticker on the side of the box. Also, some third-party high-speed USB-C cables have flanges that are too wide to fit through the hole in the “finewoven” cases, therefore making intermittent or no connectivity. I had to test a bunch of different cables at my local computer store to find some high-speed USB-C cables that do not require removing the case from the phone to make a good connection.