I’d pick the 3.
When I first moved from a dumbphone to a smartphone I was hesitant to accept a “monster phone.” Both because I didn’t know how annoying it would be to carry, and because most of my co-workers are notoriously behind the times in tech.
That isn’t just a vanity thing. Paradoxically as it may seem, for those of us in the forums that are not IT workers, it is not a good thing to continually be associated with “cutting edge” or new fangled gadgets when your superiors are a generation or two from you. As much as companies state they want “young” talent with new ideas and understand new technology, the reality is that sitting down before a meeting with a big, monster phone got looked at with skepticism and disapproval a few years ago.
Now it is more accepted as the ol’ grey-hairs have slowly started to appreciate being able to go on a business trip and not have to lug a laptop, because their phone can do their email.
Although I don’t have a big desire for those 4.3” billboard phones that are the rage with Android, a 3.7” or a 4” phone (with a small bezel) would suit me better than this 3.2” screen I have now.