Best for this product. A saved home country is stable when someone travels or uses foreign networks.
Home Country
The dashboard opens to this country when no country is specified in the URL.
How Sites Guess Country
Signals are useful, but explicit preference should win.
Common for default localization, but it follows where the user is browsing from. It would likely see France while you are in France.
Useful as a hint, but it can reflect language settings rather than citizenship or home country.
Accurate for current location, not home country, and it requires explicit user permission.