FooGallery was designed to be the most developer-friendly gallery plugin available for WordPress. It was also built on top of a solid extension framework, which means different functionality is separated out into different areas in the codebase. It also means the core plugin is lightweight, but still allowing for the most flexibility.
Image Gallery is an advanced plugin with a list of tools and options for adding and editing images for different views. This is a fully responsive plugin. The product includes plugin for adding image galleries and albums to posts and pages, as well as multiple widgets. You can add images, providing detailed gallery descriptions and tags, organize the galleries into different photo albums.