React.js and Vue.js are powerful frontend frameworks with differences in core philosophy, syntax, learning curve, performance, ecosystem, and use cases.
React is a library by Facebook, focusing on UI as a function of state; Vue is a progressive framework by Evan You emphasizing declarative, template-based syntax.
Vue is preferred for ease of use and onboarding, while React offers more control with flexibility in tooling.
React excels in ecosystem breadth and job market dominance, while Vue provides a tighter, well-integrated ecosystem for various projects.