[runjake]

Garmin.

Garmin has always had about the best track record with data accessibility, by far.

Apple Watch is probably a very distant second -- especially now since they've really nerfed the health data exporting. Launch Health app, click on user photo, click "Export All Health Data", wait forever, have "fun" parsing it.

Fitbit's always been a jerk about holding the data ransom for paid membership tiers.

[kgin]

Looks like you can schedule HealthKit exports with this app https://apps.apple.com/us/app/health-auto-export-json-csv/id...

[randomchars]

There's also this: https://apps.apple.com/hu/app/healthfit/id1202650514

It let's you schedule exports of some of your data to multiple sources. I use it to sync to Google Sheets, where I can easily build diagrams and data from it.

[HDMI_Cable]

Do you have any specific recommendations from Garmin? They seem pretty good, but I have no idea which one to choose.

[runjake]

It just depends on your sports and desires. I use the classic 920XT, but I'd really love something like the 920XT (classic fav among triathletes) but with wrist-based HRM (in addition to chest strap compatibility).

The Garmin Instinct is pretty decent, but its going to depend on your list of desires.