Speed

• Wireless-N provides much more bandwidth potential than Wireless-G. However, this advantage is only noticeable for transferring data over your local area network. Wireless-G provides a bandwidth of 56Mbps while Wireless-N provides a maximum bandwidth of 300Mbps. Since no Internet connections are this fast, it makes no difference with regards to your broadband performance, but only to data carried over the LAN itself.
  
  

Range

• Wireless-N provides a much greater range thanks to less chance of interference on the connection. If you have a large house and you want to be able to access the Internet anywhere in the building without investing in a wireless repeater and other range extender devices, Wireless-N does give you better range. It is important to remember, however, that when advertisers state the range of a wireless router, they measure it as if it were in a wide open space with perfect conditions and no obstacles.
  
  

Reliability

• Wireless-N uses a different frequency to Wireless-G. Wireless-G uses a 2.4GHz frequency that can easily be interfered with by various devices such as microwave ovens. Wireless-N maintains a clearer signal in many cases thanks to the fact that it transmits data at 5GHz.
  
  

Price

• To take advantage of the latest standard, you will need to have both a router and a wireless adapter of the N standard. Unless your computer already has a Wireless-N adapter (most newer laptops do), it can be an expensive upgrade that may not be worth it under many circumstances. Wireless-G is still the most widespread standard and it is considerably cheaper.