Apple watch is a contradiction as a health tracker b/c it can't track someone 24/7, it can't respond dynamically to sleep quality and training load, it can't coach you to a higher VO2 max, it can't last long enough to track an ultra marathon. It doesn't last long enough to profile sleep and then for the data is does gather, you need to go find several third party app developers, which may or may not exist in the future, to get insightful data out of it.
At that point the Ultra version is a waste compared to the regular version - its supposed to give you more than the regular watch, of which I've owned several, including series 0, something before the 4 or 5, I have a 7 or 8 on my desk and have had dedicated polar running watches the Garmin fenix 5x and now the Garmin epix pro but doesn't measure up to others, especially at its price point.
The apple watch is great if you're a screen person but if you're serious about your personal health or fitness there are much better options available to consumers.