[acdha]

> By the time MS acquired GitHub, Atom usage was already in decline.

I wanted to second this: I compared both, with Atom experience starting before the first VSC release. Atom had performance and stability problems continuously through that period, and never really won any of my coworkers over. A lot of that was simple performance: I remember using Is It Snappy? to test my subjective impression and finding that input latency was a full order of magnitude worse, which is the kind of thing which really colors your impression of an editor.