Paul Haddad notes that Apple’s Thunderbolt to Ethernet adapter is slightly faster than Belkin’s USB-C to Ethernet adapter and uses much less CPU. Unfortunately, the former must be chained with the Thunderbolt 3 to Thunderbolt 2 adapter. I wonder how the various docking stations compare.
Update (2017-02-09): Marc Liyanage:
Unscientific quick test of 4 USB-C-to-Ethernet adapters. Top is connected to MacBook Pro directly, bottom though LG 5K, all in Mbps.