The Apple Watch never quite reaches the same level of excellence for fitness tracking as the Fitbit Ionic. Nowhere is that more obvious than in how each device tracks heart rate. The Apple Watch Series 3 uses a green light-based optical heart rate monitoring system—the kind of system found in older Fitbit products and just about every other heart-rate tracker you wear on your wrist. The Fitbit Ionic uses the same system, but enhances it with red and infrared LEDs… More at Gizmodo.
So, two flawed products battling it out to be the best smart watch. This industry has a long way to go yet.
I do agree with the findings though in that the Apple Watch is poor for fitness, but that it is a much better watch.