My current Thinkpad has both and is very portable (14", 1.5 kg) The Ethernet port is extremely useful in the field or in the lab to connect to various devices.

My current Thinkpad has both and is very portable (14", 1.5 kg) The Ethernet port is extremely useful in the field or in the lab to connect to various devices. The SD prt is useful for imaging embedded devices, or for getting pictures off my camera.