From my experience USB-C is more durable. It has all the wearable springy parts in the cable, so replacing the cable every couple of years keeps it working like new. With Lightning the phone connector has spring-loaded contacts and retention clips that are guaranteed to wear out, and when they do you have to take apart the device and in some cases do micro-soldering to replace the connector.
USB-C has a tiny fragile 0.7 mm thick PCB levitating mid-air right in the middle of the port, just attached to one end (enabling it to irreparably bend in any direction if anything pushes it). This is in my experience way more fragile than the internal tried-and-true spring fingers.
