I have the 8.
I like the camera more on the 8 than I did the 4.
The 8 is slightly narrower than the 4, so it fits in my car holder better.
I like that it’s water resistant. I do a lot of swimming pool inspections, and not that I’ve ever dropped my phone into a pool, at least I no longer worry about it. And if it gets splashed when testing a bathtub, I can just wipe it off and keep going.
I don’t care for the curved screen though, because an otter box doesn’t fully wrap around the phone like it did the 4. So the case doesn’t offer the same level of protection.
I admit not being able to change the battery sucks, but the 8 charges faster than the 4, so so far it’s not been an issue.
The 8 has much more storage space, so I never worry about running out of space on an inspection. On the downside, I’m not as motivated to back up everything and clear off my phone of old inspections.