The Vita Slim uses Micro USB like the cellphones or Kindle Fire.
I just got one recently. That being said, so far I think Nintendo made a easier to use interface, but Sony at least made it easy to use buttons instead of the touch screen. The touch is about on par with the 3D on the 3DS, especially if I can only use my finger to manipulate it. Not a big fan of the buttons but they get the job done.
I was more asking about how finnicky the PS Vita 2.0 is about charing via USB vs the official wall cord that it comes with, but I got my answer thanks.
And if anyone is curious, the Out 2 USB slot on the Poweradd x3 portable charger (and most likely the x1 through x6 models) will actually charge a PS Vita just fine (as will the Samsung Tab port on the Poweradd 25V 5-slot USB wall charger).