Assuming my router is compromised and someone has full access to it, which is easier to intercept: WiFi or Ethernet traffic?
We're talking about only SSL traffic here.
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It all depends on how the TLS connection is handled by the client.
If you take into account that TLS was made exactly to bring security to a connection even if the router is malicious and intercepting packets, it should not matter. If the client only accepts a valid certificate before establishing the connection, neither Ethernet nor WiFi would bring any problems.
But if the client accepts an invalid certificate, both are equally insecure.