Difficult choice indeed!
A friend has the Nikon and from there I know that the Nikon has spotmeting which can be a grezat plus. But, and that I find personally less good, no bracketing option for exposure (very useful to extend the range of a shot with the help of software) and, like Onslow said, no motor inside the body so the lenses that don't come with a motor are indeed only manual focus.

There are no Borg. All resistance is fertile.