Lightning is a more robust design
I find Lightning connectors to be much more robust than USB-C and when you look at the design you can see why... USB-C is about the same size as Lightning, but has more pins/contacts and in my experience USB-C plugs are prone to problems when wiggled. I have often had to clean pocket lint out of my iPhones Lightning socket and not damaged it. I wouldn't want to have to do that to a (much more complicated and delicate) USB-C socket.
I prefer Lightning and will be disappointed if Apple abandon it in favour of USB-C for iPhones. And not angry, bitter or ranty :)