Usually the camera or other things. I usually upgrade every year because I’m on the upgrade program. Last year added the satellite SOS which meant I didn’t have to worry about no service. That and I took the opportunity to switch to the max because my eye sight got worse. I didn’t bother upgrading this year, I saw no reason. I don’t need USB-c, I use a MagSafe charger and have more lighting cables than usb-c. The feature to locate your friends using the ultra wideband chip is neat but requires your friends have a 15 as well. And I don’t really have a need for the shortcut button.