Next.js is preferred over React.js for websites due to various advantages it offers.
Next.js addresses common issues faced with React.js, such as problems with Google search visibility, slow initial loading times, backend requirements, and deployment complexities.
Key advantages of using Next.js include improved Google search visibility, faster website loading times, smooth navigation within the website, and simplified backend operations through API routes.
Transitioning from React.js to Next.js is seamless and allows for gradual changes while leveraging existing React knowledge.