Well, I always went with the base storage model in the past, but at the same time I tend to keep my phone for at least 3 years, sometimes 4+ (current one is 4y 6m) and what I have found every time is that for the first couple of years I don't have a problem with the space but with more time (3rd or 4th year), I have to start deleting the content (apps, photos, videos, music …) to make room for new stuff which tbh, I do not like. Also, it seems like a good idea to have your files locally because I have experienced it multiple times that on the road (while travelling) there are long stretches when you are out of network coverage (or poor coverage) and it is difficult to stream something. I think when Apple releases its new phones, the base storage option they provide is only good if someone plans to keep that phone for a max of 2 years and then upgrade (and chose a bigger storage model based on his/her latest usage pattern), but if someone wishes to keep the phone for 3-4 years (like I do) then it is best to go for the higher storage options. So, this time I am contemplating on the 512GB or maybe even the 1TB model.