Kacbu lists 2 Processors that stand out for Health Tracking: Apple, Samsung. Each product is here because its editorial assessment found it strong for this use; the order is the Match score, computed from official specs and verified editorial tags, with the reasons under every card.
For health tracking, having a sensor and a feature working are not the same thing. A measurement may exist in the hardware but be off in the software, or only enabled in some countries; features like ECG and blood pressure need approval country by country. Look at the page where the maker states which feature is active where, not at the sensor list.
Each card carries what sets the product apart. Open the product page for its strengths, weaknesses and alternatives.
2 · 2 · SoC (soldered)