I know the photos don't do it justice, I took them with the iPhone, and if you click the screen it focuses differently. I think I did that between pics. 6000k are much whiter in person, although personally I wouldn't of minded a tiny but more tint of blue in there.
But I suppose technically 4300k would be brighter? I noticed the 6000k are marginally not quite as bright on the road, but it's to be expected.