isocpp/CppCoreGuidelines

Prefer this fork only if you need its custom presentation or editorial changes and are prepared to own a long-lived divergence. If you want current C++ Core Guidelines content, upstream is the safer choice.

Prefer upstream unless you specifically need this older customized fork. Choose this fork only if its local presentation, syntax-highlighting, or documentation workflow matters more than freshness and completeness.

Prefer this fork only if you need the 2015 snapshot and its local customizations. If you want current C++ Core Guidelines content, active maintenance, or a low-risk adoption path, upstream is the better choice.

Prefer this fork only if you want a near-identical upstream copy under a different namespace for your own edits. If you want added features, governance, or a customized guidelines distribution, there is no evidence this fork provides that yet.

Choose this fork only if you need a custom, long-lived derivative of the guidelines and are willing to maintain it yourself. If you want current C++ Core Guidelines content or low-risk adoption, upstream is the better choice.

Choose this fork only if you specifically want the translated/customized variant. For most adopters, upstream is the better default because this fork is stale, substantially behind, and likely missing later guideline updates and fixes.

Choose upstream unless you specifically need this fork as a starting point for your own copy or internal edits; it offers no clear functional advantage and is already slightly behind.

Prefer upstream unless you specifically need an older frozen copy; this fork adds no visible value and is significantly behind.

Prefer upstream unless you specifically need a frozen snapshot or plan to do your own maintenance. This fork does not show added capabilities, and its staleness makes it a weak default choice for adopters.