Yes, I've been learning that the Fitbit step counter is more accurate than Apple Watch / Apple Health in tracking walking/running steps. Fitbit has a sophisticated set of sensors to track the actual steps, whereas Apple provides estimated steps based on accelerometer data and average stride length. As a result, I have found that Fitbit is consistently about 800-1,000 steps MORE than Apple Watch/Health in the course of a given day, when I wear both devices properly and for the entire day. There are several articles online that confirm that Fitbit devices are more accurate in counting the actual number of steps taken while walking/running.