I do not have the surface dock so I can not compare. This is very portable comes with the power supply but you only need that if your hooking up something like an external drive or DVD drive, a thumb drive works with no power adapter the Ethernet works with out power adapter. it cost about $39.49 on amazon. the dell one has no external power so it is for just mouse or thumb drive. it has the monitor and HDMI ethernet and USB 2.0 it is 58$ on jet.com called DA100 hope some of this helps.