If I understand correctly, the job of the data cable is to transfer current from a wall charger or computer to a phone. Through this current the phone decipers the zero and 1s to make it code/data. Now shouldn’t current flow at the same rate between two cables, provided the thickness/resistance is the same?
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Data communication is entirely unrelated to how much current you pull through the wires.
To answer your question, though, probably one of the most important factor is that USB C simply has more communication wires to work with than Lightning does.
Imagine you’ve got an office building with two phones. Now imagine there’s another office building with three phones. The office with three phones is going to be able to handle more calls and communicate more overall information than the office with only two. They’ve got a whole extra phone they can use.
It gets more complicated, but that’s a major difference between the two protocols.
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