I was talking about International standards and speed, not distance...
All the best Brett
The primary objective of dual-band is to reduce interference from other 2.4ghz networks (given that it's nearly impossible in residential areas to attain a 5 channel separation), and shifting 802.11n onto a separate frequency so as to not reduce the range for 802.11g devices if your network includes both. The 2nd and 3rd cards cannot do this so they are not implementing the same set of standards, nor are they the same speeds as 802.11n at 5ghz has a theoretical max of 450mbps and 300mbps at 2.4ghz.
Edit:- The TP-Link aso supports 802.1x and the others do not, though I will admit it's unlikely the OP will require that.