Faster import device or files

I am now having a doubt (shame on me, an expert user that doens’t know this) 

The question:

Is it faster to import form “Source > Device” or “Source > Files”?
What is the best choice?


P.s.

In my defence I didn’t know that whatever you type first before posting now becomes your title and you can’t edit it.
I look like a total analphabet.