Gulp is a task runner and provides a more flexible and configurable build system. It allows developers to define complex workflows by chaining tasks together using Gulp's API. Rollup, on the other hand, is primarily focused on module bundling and follows a configuration-based approach. It provides a simpler and more straightforward configuration setup compared to Gulp.
Rollup is known for its excellent build performance. It is optimized for generating smaller, more efficient bundles by eliminating dead code and performing tree-shaking. Gulp, on the other hand, may not be as performant in terms of build speed and bundle size optimization.
Gulp has a vast ecosystem of plugins, allowing developers to easily integrate with various build tasks, such as CSS preprocessing, image optimization, code linting, and more. Rollup has a growing plugin ecosystem, but it may not have the same level of plugin support as Gulp due to its more specialized focus on module bundling.