These two lenses are almost identical. Differences usually are due more to focus issues than either lens being a champion.
At the wide end, they're the same in the center.
The 16-85mm, on a D200 or D300, is superior at the wide end in the corners, if you look at your images at 100% on-screen, which is like looking at a 3-foot (1m) wide print from the same distance as your computer screen.
My 18-200mm is a little better at 85mm.
I've never had any issues with sharpness from my 18-200mm for anything I've done with it, including making 20x30" (50 x 75cm) SuperGloss prints from it. When was the last time you printed 12 x 18," much less 20x30?"
I only see these differences by 1.) shooting special test subjects (flat at infinity), 2.) at full aperture, and then 3.) blowing up the images to the equivalent of 40" (1m) wide, and looking at them closely.
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I pronounce this aspect a draw.
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