HTML5 Boilerplate is ideal for developers looking for a lightweight starting point, emphasizing performance and flexibility, while Materialize is best for those wanting to implement Material Design quickly with ready-made components.
Materialize
Pros:
Material Design principles
Predefined CSS components
Built-in responsiveness
Easy integration with JavaScript frameworks
Extensive documentation
Cons:
Can be heavy due to numerous styles
Learning curve for those unfamiliar with Material Design