User blog comment:MisterWoodhouse/The first migrations to the Unified Community Platform/@comment-25205196-20200527213207/@comment-24036697-20200528023326

WikiActivity is an interesting case. I know I personally use it to quickly view whether anybody has made any recent edits to pages on my fan fiction wiki. If I see a username that I don't recognize making edits, then I'll go further and see what kind of edits they are making.

TL:DR, WikiActivity is good for a quick overview whereas RecentChanges is better for seeing details of edits.