Hi,
In the last period, I receive a lot of question regarding differences between devices.
For example "What are the differences between NE 20 And NE 40" or "What are the differences between AP6050DN and AP4050DN"
For all of you who want to compare 2 or more devices, I recommend the following tool :

It can be accessed from here
You can compare different products like Routers, Switches, WLAN Products and devices from Transport and Access Network.
I hope that this tool will help you to clarify your questions 
