I sporadically maintain a list of the top 100 articles in English, as a guide to localizers of what is most valuable to translate.
It’s an interesting question, which localized pages tend to get a bounce to the English version. It is a combination of whether the localized page is up-to-date and whether speakers of the language prefer their own language vs. English. Maybe @atopal can provide some insight.
We often hear from readers that they get MDN articles in their language, when they’d rather have them in English. This post explains why that happens and how to get around it. We’ve also discussed having a profile setting for “Always show me articles in English.”