Sony Cyber-shot DSC-W30 vs Nikon D200 camera comparison
Nikon D200 has larger screen (2.5") than Sony Cyber-shot DSC-W30 (2").
With its stated 10.2 maximum screen resolution Nikon D200 digital camera is able to produce finer pictures than Sony Cyber-shot DSC-W30 which has 6Mpix picture quality.
Sony Cyber-shot DSC-W30 has optical zoom of 3x and Nikon D200 doesn't have any. For Nikon D200 you should buy special external lenses. You choose lenses by your needs and preferences. That is the characteristic of some professional models.