Thanks Peter(s). I got it now. Maybe if I keep asking these dumb questions I'll figure out how to take a picture.

I found a sight with some info and test results on both lenses.

http://www.popphoto.com/cameralenses/2695/lens-test-olympus-zuiko-digital-ed-18-180mm-f35-63-af.html

http://www.popphoto.com/cameralenses/2763/lens-test-nikon-18-200mm-f35-56g-dx-vr-af-s.html