Runtime model
react-bun-ssr
Bun-native server, build, file, markdown, and runtime APIs are the starting point.
Next.js
Node and Vercel ecosystem integration are the center of gravity, with broader runtime targets.
Framework comparison
react-bun-ssr vs Next.js for Bun-native React SSR.
This comparison is not a claim that one framework is universally better. It explains where `react-bun-ssr` is intentionally smaller and Bun-first, and where Next.js remains the safer, broader platform choice.
Tradeoffs
The real difference is scope and runtime ownership.
Framework scope
react-bun-ssr
Small SSR framework focused on file routes, loaders, actions, streaming, and markdown routes.
Next.js
Full-stack React platform with App Router, React Server Components, image/font tooling, and hosted platform integrations.
Best current fit
react-bun-ssr
Docs, content-heavy SSR apps, Bun-first projects, and teams that want a smaller request/runtime surface.
Next.js
Large product apps needing a mature ecosystem, RSC architecture, broad hosting support, and many batteries included.
Operational tradeoff
react-bun-ssr
Less framework surface and fewer abstractions, but a younger ecosystem and more responsibility for app decisions.
Next.js
More ecosystem defaults and integrations, but more framework behavior to learn, configure, and debug.
Decision guide
Choose based on your constraints, not framework hype.
Choose react-bun-ssr when...
- You want server-rendered React built directly on Bun rather than a Node-oriented adapter stack.
- Your app is content-heavy, documentation-heavy, or benefits from first-class markdown routes.
- You prefer explicit loaders, actions, middleware, and route files over a larger full-stack platform.
- You are comfortable adopting an experimental framework while the API surface is still being shaped.
Choose Next.js when...
- You need the mature Next.js ecosystem, hosting defaults, and broad team familiarity.
- You want React Server Components as a central application architecture primitive.
- You depend on mature image, font, caching, deployment, and platform integrations out of the box.
- You need low organizational risk more than a small Bun-native runtime surface.
Evidence
Benchmarks support the current content-heavy SSR story.
The benchmark is intentionally narrow: markdown content and local-data SSR on the same machine, in production mode, against Next.js 15 and 16 across Node 22, Node 24, and Bun. It is useful evidence, not a universal performance guarantee.