Difference between Request (Facade) and Illuminate\Http\Request

I'm starting to use Laravel and I would like to know how I should choose one over the other.

As of version 5.0 Laravel documentation changed request example from Request::get('form_input') to $request->get('form_input'), but I couldn't find any explanation as for why they've done that.

My doubts are: Is there any difference between those Requests? Whare are they? What's the most prefered?

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