Before jumping at Google/Fitbit train, take a look at Withings watches. Their Healthmate app is solid. In my experience much better than Fitbit, and it isnt trying to sell me on any premium services.

I have a Steel HR & the battery life is measured in weeks.

If I end up not buying a new Apple Watch, I will look into it! My Fitbit broke recently and I'm on the market.

The EKG is ... really tempting, though - that's about the only thing that's pulling me toward the Apple Watch.

I’m curious, why is the EKG feature that tempting? I don’t really see what I’d do with it besides doing a reading once in a while

I have OCD and one of its manifestations is hypochondria and fear of any arbitrary chest pain. It'd be nice to have some software that could assuage the random fears so every little tinge in my chest didn't send me running to an Urgent Care.