Lightning connector is smaller, more robust being a straight male connector as opposed to some weird female-in-male contraption. The port is beveled so it slides easier unlike USB-C whose edge catches and I always have to fumble around. Not as bad as the old USB connector were, with their legendary 3 flips to find the right orientation, but still.
No idea what corrosion you are talking about as I never encountered it. I don't need 240W to charge my iPhone, is't not a freaking Tesla and I prefer to prolong the battery life. I will give you the data bandwidth even though today's wifi is quite fast but for laptops MagSafe is an even better charging port, and I hope someday for iPads too.