Not necessarily an indication of actual user base; could just be that more/less devs of each "group" are deciding to participate.
Side note; I decided to move from PyCharm to VSCode and honestly, I am starting to miss PyCharm. Yes, it's sluggish to boot but it handles Python so much better: better inspection, highlighting, better Git integration (3-way merge!) and better tooling all round.
I find myself having to mess around in VSC's settings.json for far too long, scrambling to find the relevant extensions documentation because god forbid you include all the keywords somewhere easy to find in the IDE! And to top it all off, there's currently some annoying bugs with error highlighting in VSC that make it a pain to use.