The key differences between a standard and a pro tend to be a camera optical zoom & number of megapixels (but as they have multiple lenses these days it could just be one or two of three lenses that have any difference, there may be more space depending on options taken
With a slightly bigger handset comes with a slightly bigger battery and longer battery life, but also a bigger phone that means stretching your thumb further
There can be other slightly different features as the pro gets the new features and standard inherits previous pro features as they become standard
Pro models cost more
I take photos, so my iPhone is the camera in my pocket, and whenever I upgrade I weigh up the optical zoom differences between models
Battery life can always help, but it lasts as long as it lasts whilst more features use up more power
I can either last a full day between charges or top up by battery pack.
Though I look at the camera features I prefer to use a DSLR which is many years old therefore the iPhones megapixels etc outclass it, but if I’m being ‘serious’ about photos then my DSLR is the option
(I use WiFi cards in my DSLR, so whenever want then I can directly transfer from camera to phone and load to social media)
If I’m being ‘fun’ with a camera then I use a Camp Snap which is a ‘retro’ basic point and shoot with limited megapixels and no screen - so I have to wait until I get back to a computer (replicating the old days of taking a photo and waiting until you can see the results, rather than looking on a screen and re-taking)
If you’re happy with your choice and you don’t need the latest new thing then the ‘standard’ new thing is perfectly fine