I guess my point was that the odroid will actually transfer over the Ethernet at almost saturation speed.according to iperf. It will also do a good job of maximizing the transfer from a usb3 to SATA adapter, assuming the adapter is up to the job -- mine isn't when it comes to a good SSD. At any rate it, I believe that it massively outperforms a pi at being a headless server.
Nope. Those ODROIDs that have USB3 implement also Gigabit Ethernet via USB3 (doesn't matter, just slightly higher CPU utilization compared to 'real' GbE). But the only good ODROID choices currently are HC1 and HC2 anyway (C1/C2 have all USB ports behind an internal USB hub and XU4 suffers from USB3 receptacle problems -- see my signature)
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