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You have more functionality in 16-bit and even 32-bit mode. Depending on your needs, however, you may spend most of your time in 8-bit mode, which is more than likely all you need.

Bit depth, or pixel depth or color depth, measures how much color information is available to display or print each pixel in an image. Greater bit depth means more available colors and more accurate color representation in the digital image. In Photoshop, this increase in accuracy also limits some available features, so don’t use it unless you have a specific request or need for it.

To use 16-bit or 32-bit color mode, you also must have a source to provide you with that information, such as a scanner or camera that offers a choice to scan in either mode.