I don't know whether Nikon is "the best". I suppose, in terms of technology and ergonomics, Nikon and Canon are, generally speaking, on the same level. Both make great cameras and great lenses (and some not so great ones). Sometimes things are trivial: I still use Nikon equipment, because I bought my first Nikon camera in 1977. Once you've got your array of lenses, you're more or less hooked to a system. So I stuck with Nikon, even when I switched from analogue to digital. The D4 ist not the greatest camera on earth - I hold the D810 in higher esteem -, but it served me well in the last 4 years. As I often do close-ups and macros of plants (and sometimes insects) in gardens and in the wild (recently in the Drakensberg in South Africa), where I cannot use a tripod and where there is often some wind, I'm reliant on a fast and robust camera with high sensitivity which allows me to take hand-held shots at short shutter speeds with great DOF (usually using the Micro-Nikkor 2,8/105mm). Video doesn't interest me, but a somewhat higher resolution would be nice for cropping. My 5K display has almost as many pixels as my D4, so cropped pictures often don't even cover the entire screen. And an embedded GPS would be nice, too.
