If quality is high on your list of criteria, an optical zoom makes more sense. However, most zoom cameras come with both optical and digital, i.e., a 3x optical and a 2x digital. Some models have special adapters that allow you to attach other, sometimes proprietary, lenses to achieve different focal lengths. Some higher end digital cameras have interchangeable lenses so you can take advantage of the quality and versatility of compatible 35mm SLR lenses. As we mentioned earlier, pixel count isn't the only determinant of image quality.
Optics play a large role in delivering high quality, sharp pictures.
The best proof of a lens' abilities is evident in the image. Specs, benchmark tests and even the brand's heritage are helpful in determining the quality of a lens. Digital cameras offer a wide range of options-from automatic everything to a combination of auto and manual. Assuming you are knowledgeable about f-stops, shutter speed, ISO, white balance, etc., the ability to control these variables will better your chance of getting the image you want. Some models work better than others.