Having seen many hundred machines with both my answer is maybe one will work better than the other. Given the years of seeing all this and one work better than the other and then reverse on another machine my lesson is that you can't state one will always be better.

The G650 was a dud here and I gifted mine out on freecycle (see google) years ago. I wonder if it lives on to haunt owners that keep trying to make it work better.

About the D600. With internals I've lost track how many times I find the antenna cables unplugged.