I have used WebStorm at work for the past three years. But last month I used VSCode exclusively for four weeks, because I wanted to learn it. I noted my observations here.
Eventually, as a deadline approached, I switched back to WebStorm. Why? VSCode is very good, and I was impressed. But I still find WebStorm is slightly better at a few things which I use very frequently. These small improvements really add up when I'm trying to get stuff done.
In keeping with the Pareto principle, small advantages with only a few commonly used features are enough to make one editor stand out for me. Specifically, "Go to Definition/References", "Searching" and "Carrying imports" are so important, that just making these more convenient means that all other concerns are irrelevant.
So, for the reader's convenience, these are the first few features I will address below.