Full Answer

Think of them as two roads to the same destination with different reliability. The Pixel lives in the browser, which gives it rich page context and instant firing but puts it at the mercy of everything between your code and TikTok: extension-based blockers, Safari's ITP, consent management that withholds the tag, and flaky mobile connections. On a meaningful share of sessions the event simply never leaves the page.

The Events API takes the server road. Your WooCommerce backend builds the event and posts it directly to TikTok, so no browser obstacle can intercept it, and you can include SHA-256 hashed email and phone so TikTok matches the conversion to a user without a third-party cookie. The cost is that it requires server-side implementation and careful field mapping rather than pasting a snippet.

The important nuance is that they're complementary, not competing. The Pixel contributes browser context and immediacy; the Events API contributes resilience and richer matching. Running both with one event_id per event lets TikTok deduplicate the matched pair and keep the fuller record, which is the same pattern stores already use to pair the Meta Pixel with Meta's Conversions API. Pixel-only tracking is the legacy default; Pixel-plus-Events-API is the resilient one.