I can confirm for France, the French edition of Wikipedia is usually good, especially for science-related topics and local things.
I would say it's the case if the information in their primary language is sufficient (and even if it's not, there may be other sites). I defaulted to enwiki as it provides more information and less attempt to control the narrative structure of the same article in my primary language (YMMV on the latter, though)
Its crazy how different languages on the same article can have completely different tones and give a different idea of the subject even when they fundamentally have the same facts listed.
I don't understand why you're being downvoted, this is a straight fact. The amount of political bullshit in an article is inversely proportional to the number of contributors, and in most cases the English version has more editors.
For exactly the same reason en.wiki is more likely to be correct on scientific and technical subjects.