Good, though in practice it's not the charger the problem, I use the same USB plug everywhere, it's Apple and their cable. Right now I always need with me a micro USB cable, an USB-C one, and Lightning, because Apple thinks different™. What's Apple reasoning for not abandoning Lightning for USB-C on their phones?
The male lightning connector is a single flat piece; the female connector is a hole with the contacts on the top + bottom of the port.
Compare to USB-C, which has an exposed "tab" in the middle of the female connector, and the male connector has a matching "hole" in the middle.
This makes USB-C more vulnerable to e.g. dust collecting, and damage of the exposed tab. Unlike lightning, which can collect dust in the female port, but it's easily cleaned out using a paperclip or SIM card removal tool.