I’m content with Apple Health. Blood/other test results go into it. Most test providers support it natively.

I don’t really review it much anymore but it was instrumental for my doctor during some health issues. All my data was in one app and doctors are familiar with the app and can get around it quickly.

So it was most helpful as a conduit for your doctor to get more granular info about your health issue? That's great to hear. I wonder about things that don't rise to that level, like nutrition and resting heart rate that can be important for longterm health. A doctor will likely give general advice for those things if no critical issues are present. But if I've got all this data, why not make use of it before an issue arises?