Fitness tracker vs. smartwatch — which should I buy?

If you mainly want steps, heart rate, sleep and notifications with multi-day battery, a slim tracker (Inspire 3, Xiaomi Band 10) is lighter and lasts longer. If you want on-wrist GPS, contactless payments, more workout modes, and a larger display, a hybrid like the Garmin Venu Sq 2 or Amazfit Bip 6 is closer to a true smartwatch while still keeping multi-day battery.