Photo books are superior to galleries in many ways:
They are very customizable compared to photo albums where that option does not exist or is very limited. It does not take much time to create your own photo book and you can add features such as text and frames on your photos to help with organization and ultimately make it your own brand.
Photo books are fairly cost friendly, you can print tens to hundreds of your photos compared to buying an album for the same cause.
Photo books are great gifts for family and friends, and allow you the opportunity to express gratitude with your own creations. These are great for your family and friends that want to store their memories in one place.
Photo books are great as a portfolio tool for sharing your work with potential clients in a professional manner.