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I’ll add that if you care about working out with a watch to track heart rate, the Apple Watch is pretty dismal. I moved to pairing mine with a Polar H10 strap so that I could get much faster feedback on heart rate recovery post sprint. In addition to using an optical sensor, the Apple Watch may also be doing something to smooth out the signal. I just know that the Polar seems much more responsive and matches how I am feeling.

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Chest straps work with ECG, so they're hard to beat for heart rate tracking. That said, Apple watches are some of the best wrist wearables for heart rate tracking. Most other brands aren't as accurate and many don't come even close.

Check out the Quantified Scientist on YouTube, he does some interesting testing on health devices.

Well aware of Quantified Scientist and it’s actually what I have pointed many Oura, Woop, etc users to in the past.

But as you say the always-on ECG of a strap like Polar H10 always going to provide a superior result.

I’m not using it for live-live data, or for mapping recovery times, I’m just using it to gauge 120 vs 140 vs 175 heart rate while running

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