You have to remember that a wired network is faster than a wireless network hands down. No questions about it. With a wired network you are directly plugged in with nothing interfering with the connection. Which is why I have the majority of my network wired (computers, notebooks, PS3, etc). It is more reliable and have better communication speeds (1Gb connections).
With wireless, you have to consider signal degradation, signal interference, overhead, throughput, etc. Wireless will be inconsistent, be dropped and fluctuate based on many factors.
For my Note 2, I sometimes get really bad tests. The lowest I got for my WiFi connection was 3.2Mbps down and 1.23Mbps up. The highest was 14.56Mbps down and 10.97Mbps up. The Note 2 always fluctuates on these tests and give inconsistent readings.
My computer on the other hand has been pretty consistent with these tests. Always setting in between 14-15Mbps down and 10Mbps up.