Wireless Mechanical Keyboard: Bluetooth or USB?

I am a total newbie to the mechanical keyboard. I have one wired mechanical keyboard already. Recently I am considering to buy a wireless mechanical keyboard, but I still don't determine to buy a Bluetooth or USB connectivity. Anyone could offer some advice. Thx:)
 
If you have enough usb ports, opt in for a wireless keyboard with a dongle.
Make sure the keyboard is in good range to interface with your desktop.
Find some really good Duracell rechargeable batterys.
Most brands like them alot especially Microsoft and logitech brands.
 
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