Nikon D600 Auto White Balance options 1 or 2

I usually use Auto White Balance with my prevoius Nikon  cameras (D300s D700). When I was shooting with my new D600 today and started editing I noticed the colour balance a bit different, I was shooting scenery shots with a lot of green fields.

I notice the green a lot different  to what I was use to I checked my camera and I realized it had two Auto White Balance options, mine was on Auto 1. What have other users found with the White Balance do they shoot Auto 1 or 2?

Here's a couple of examples taken today , do these look natural to you, I quiet like it.