iPhone 6s, 64GB - easy to use, plenty of apps, shares contacts, mail & calendar across my iPad and PC (Google Chrome). I don’t want anything larger and, after replacing the battery for $30 in December, I’m not sufficiently impressed by new features on newer iPhones. I’ve not liked the Android and other phones some friends have. Probably because I’m 57... Also, 75% or more of family & friends have iPhones and there are a few communications and sharing conveniences that allows.
It drags a bit at times, but just a little and not often.