A couple build questions/concerns

I have a couple questions. First, what's the major difference of USB 2.0 vs 3.0 and is it worth paying the extra. Second, if a motherboard has built in wi-fi do I need to buy the wireless card with the antennas? Bare in mind I'm a travel nurse so I won't be able to hardwire everywhere I go and will need a good connection. And third, I was pricing a build against an ibuypower machine and the pre-built came out cheaper for the same components plus some. Which would you do and why? This PC will be primarily for gaming. Thanks in advance.
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    The difference between USB 3.0 And 2.0 Is the reading speed, It doesn't really matter if you have 2.0 unless you're constantly using USB Flash drives.
    And to be honest i don't know enough about wifi to answer the second question, And the pre-built is cheaper because big companies are trusted, and independent builders aren't.
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