The case for upgrading
The iPhone 16 Pro added three things the iPhone 15 Pro Max lacks: a smaller body with a larger 6.3-inch screen (via slimmer bezels), the 5x tetraprism zoom on both Pro sizes, and the A18 Pro with an extra GPU core. If any of those matter to you, the upgrade is justified. See the full iPhone 16 Pro and iPhone 15 Pro Max specs to compare the full sheets.
The 5x zoom — the real headline
The iPhone 15 Pro Max's 3x telephoto was the main reason to consider the Max over the smaller Pro last cycle. The iPhone 16 Pro fixes this: both Pro sizes now get 5x. If you chose the iPhone 15 Pro Max specifically for reach, you can downsize to the Pro form factor without losing zoom.
Display and size
The iPhone 16 Pro has a 6.3-inch panel in a body barely larger than the old 6.1-inch Pro. If you found the 6.7-inch iPhone 15 Pro Max too large, the new Pro is a meaningful ergonomic improvement. Both are 120Hz Super Retina XDR — the difference is peak brightness and size.
A18 Pro vs A17 Pro
The A18 Pro is ~15% faster in CPU and brings an extra GPU core. In day-to-day use you will not notice — both chips are smooth for every task. The chip upgrade matters if you do heavy video editing, use Apple Intelligence heavily, or plan to keep this phone for 5+ years.
Verdict: upgrade or not?
Upgrade if: you found the iPhone 15 Pro Max too large, or you are on an iPhone 13 or older. Hold if: you have the iPhone 15 Pro Max and the 5x zoom + slimmer body are not priorities. The iPhone 16 Pro is better, but the iPhone 15 Pro Max remains excellent — do not upgrade for marginal gains.