To break those 6 vs 6+ discussions Most people will use Watch only together with iPhone, but which one of two is the better fitness tracking device. Sure Watch has HR sensor and it's more portable, but that's about it. I suspect they both have same/similar M chip integrated inside. iPhone has GPS so for runners it might actually be a better device. I was actually expecting more sensors integrated with watch. At the moment apple watch is not match for Garmin as fitness device.