The Edimax has good Radio.
It comes with Movable External Antenna, so it can be set for better signal propagation.
It has Drivers for all main stream OS,
Wireless Cards are Not Cars the brand name is meaningless, there are only few OEMs that manufacturer Radio chipsets, and every one buy from them and visually customize the OEM Drivers to their Brand.
If a company spends more money on marketing (which has No bearing what so ever on the technical quality of the device) like the top Brands do, the price is higher coz they need to compensate for higher marketing expense.