Well, it's up to you, but I tend to keep my phones a long time. I'm still on a 7 Plus actually, and I'm keeping it until next year. (It has the same A10 SoC as the just-launched 10.2" iPad.)What about replacing an iPhone X with an 11 or 11 Pro Max?
If I had an X, I would not upgrade to an 11 Pro. I probably wouldn't change to an 11 non-Pro either. The 11 non-Pro shows more info, but with a lower end screen, and in a much bigger form factor. Similarly, going from the X to the Pro Max depends upon whether or not you want that 22% bigger screen, and are willing to part with the bucks. I like bigger phones than the X, but the logical upgrade path from an X to a bigger phone would to the Pro Max.
Mind you, I still think the OLEDs are hella expensive, so 11 does become an option, esp. since it now has a dual-lens camera, and if you don't mind the 326 ppi LCD.

That's from AppleInsider.
Also, check out this page with regards to sizes:
https://www.paintcodeapp.com/news/ultimate-guide-to-iphone-resolutions
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