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So really whatever works best for you - if you are close enough to your WiFi source, you don't really care about loosing a USB port - and couldn't be bothered opening things up and messing around inside there is no problem with USB WiFi. Yea look WiFi is already SO MANY MANY times slower than USB, even on its best day it makes no real technological difference, other than POSSIBLY, if you believe that you are going to be on the very edge of your routers WiFi signal, that some internal WiFi cards have nice big antennas on a length of cord that allow you to place the antenna here & there until you get it just right - that said there are also USB dongles with antenna but without a USB extension cord they can be difficult to position.
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