PostHog and Mixpanel are both event-based product analytics. PostHog is known for an open-source, self-hostable all-in-one suite bundling analytics, session replay, feature flags, and A/B testing. Mixpanel is known for a mature, polished, analytics-focused product with strong funnel and retention reporting. Neither is objectively "better." The right pick depends on what you're optimizing for.
Choose PostHog if you want one open-source tool covering analytics, replay, and experimentation. Choose Mixpanel if you want a focused, best-in-class analytics and funnel-reporting tool.