Gotta say that although I wholly support standardisation, my first experience of having a USB-C iPhone for the past year has not been that great; I hate to say it but Lightning was better UX, for 2 main reasons:
1. The USB-C port is more of a pain to clean pocket lint out of, because of the little “toungue” in the middle
2. It just doesn’t stay in very well, any little nudge can dislodge the cable out enough to stop it charging
Summary: in principle better, in practice worse