Power iPad from Mac Book Air USB or iPhone charger?

I don't have my iPad charging adapter, but I do have the cord.
Should I plug into the USB port on my laptop or the adapter that I got with my iPhone? 
I realize the iPhone adapter block only puts out about 2W.   Is there more or less power if I plug into my Mac Book's USB?

I would use your MacBook USB port. My MBP from late 2011 does a nice job of charging my iPad 3.

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