facebook/react

Prefer this fork only if your goal is specifically the fork's Suspense/server-rendering experiment. For most users, upstream React is the better choice because this fork is stale, heavily diverged, and missing years of upstream fixes and features.

Choose this fork only if you explicitly need a legacy, highly customized React tree with extra maintenance tooling. If you want current React capabilities or low-risk adoption, upstream is the better choice.

Prefer this fork only if you need an older, heavily customized React baseline and are willing to own long-term divergence. If you want current React behavior, tooling, or compatibility, upstream is the better choice.

Prefer this fork only if you need its older customized React snapshot or internal experimentation work. For normal application or library use, upstream React is the better choice because this fork is stale and materially behind current fixes and features.

Choose this fork only if legacy browser support is the primary requirement. For almost everyone else, upstream React is the better choice because this fork is frozen, heavily diverged, and missing years of maintenance and feature work.