In a detailed comparison of authentication platforms for React and Next.js applications, better-auth and Clerk are evaluated based on factors like security, implementation complexity, cost, and performance. Better-auth is praised for offering complete control and database ownership, making it suitable for high-volume applications needing extensive customization, though it demands significant developer time and lacks formal compliance certifications. Conversely, Clerk, a managed service with enterprise certifications, excels in rapid deployment (15 minutes) and minimal maintenance, appealing to most React and Next.js teams due to its pre-built components and compliance with security standards. While Clerk provides a streamlined, cost-effective solution for small to medium user bases, better-auth finds its niche among teams needing tailored authentication solutions beyond the scope of managed services. The choice between these platforms hinges on specific project needs, such as scale, compliance requirements, and available developer resources, with Clerk generally favored for its efficiency and reliability in typical use cases.