In the final analysis, you should experiement a bit. High resolution cameras do not necessarily translate into higher quality. Other factors also contribute to image quality such as the particular camera you are using and the particular medium you are using to project or display the images. Linear arrays are moved in steps across the image plane of the camera, recording or scanning successive lines of information. Matrix arrays grab the full scene, but may require more than one shot to register full color.
Optical zoom makes the picture appear as if it was taken with the camera closer to the subject.
Digital zoom works by processing the image within the camera. Digital zoom can enlarge an image many more times than optical zoom can, but the image quality of an optical zoom is much better. Complementary metal oxide semiconductors are more power efficient and relatively inexpensive to make. The more bits, they more color. For example, a monitor with a bit depth of 4 can display 16 different colors.