Both are very good but so are most ultrawide lenses for landscape and cityscape. Just like macro, every company has a good one. But each has an advantage. The Tokina obviously is fast at 2.8 and is the choice if you need speed such as interior handheld shots. That does not seem to be one of your needs since landscapes are tripod longer captures. Your work will be primarily stopped down and slow ss. Both are very sharp at f/8. Both have good color and contrast. My own experience with them suggests the Nikon is slightly ahead in distortion but both have less distortion and less complex distortion than the very popular Sigma 10-20. The real difference between these two lenses is range for a tripod shooting landscaper. In that, the Nikon is better. I have a Sigma 10-20 3.5, The big brother to the more popular variable aperture dx model, and a Nikon 10-24. I use the Sigma more but the Nikon is better in many cases like when there are straight lines in two axis. Bottom line is that either is better than any wide end of any mid zoom. You could worse than the low cost manual focus Samyang 14mm 2.8 for only $350. Af is not needed for landscape Stan St Petersburg Russia
I can't help on a comparison, but since you don't have many responses, I thought you might find it useful to hear that I have the Tokina and I am VERY happy with it. I researched it extensively before I bought it and it is a first rate lens.
When I was debating the same thing, I bought the Nikkor 10-24. Why? It is f3.5 at the wide end, so the f2.8 Tokina does not have that much of an advantage. The 10-24 zoom range makes the lens much more versatile as a walk-around. Lots of times I'll go out with just one lens, and at the long end the 10-24 approaches the "normal" range. I've been happy with the Nikkor, but I know lots of people love the Tokina. Both are good lenses, and it's nice we have a choice of so many good lenses at the wide end on DX.
>In addition to a lot of Nikon glass I have the Tokina 11=16 >f2.8. I went with for the wide aperture, great build & >price and am very happy with it. Its as solid as a rock. > >Steve
I agree with Steve. Bought the Tokina and have never regretted the choice. It is very sharp and the color is excellent. Very little distortion and what there is can easily be corrected in Photoshop or Lightroom. Problem is it is a DX lens and my go to body is now the D800. Doesn't work well on it. Probably going to let it go soon.