Andrew Su, 20/12/2017 20:19:
In any case, pointers on the two stats I'm looking for are still welcome!
Ok. I don't think the number of edits is especially meaningful, but Wikidata easily wins this metric over any other project, even if you combine all Wikipedias.
https://stats.wikimedia.org/wikispecial/EN/TablesWikipediaWIKIDATA.htm shows 14 M/month (although G>I must be an error) and in https://stats.wikimedia.org/EN/TablesDatabaseEdits.htm under Σ you can see all Wikipedias combined are around 10.
Federico