I currently use VSCode. I did use Emacs for quite a while, and it in itself is a fantastic editor (if not, an operating system :^), don't get me wrong. But I had a few reasons for switching.

• Emacs is a very rigorous editor to configure, and whilst it comes with many features out of the box, a lot of those are either broken, or highly unfinished / unpolished, so it is effectively required to manually configure your environment. This also includes that the codebase for GNU Emacs itself is, and is still built upon, a fossil, and it can show it's age in a few ways. VSCode is typically ready for development out of the box, if not, easy to get set up using plugins, and customization usually just takes tweaking a few things in the settings.json at most.
• Improved language support is a must in many cases. Emacs language support or LSP is usually good, but in some cases it can be quite unoptimized (for example, the Dart LSP client on Emacs does not run well whatsoever in my experience). On VSCode, the language plugins are quite often official, and can come with some extremely helpful features.
  • On this, Jupyter Notebook is absolutely perfect on VSCode. Yes, Org Mode works great, but Jupyter is typically the most expected in my usecase, especially in standardized data science. EIN works, but it's not nearly as smooth and efficient to use as the VSCode support is.

Again, Emacs is great, I configured my environment myself using parts from Nano Emacs, and a good Evil mode configuration is an ergonomic dream (yes, I also use VSCodeVim), but it gets tiring to maintain it after a while, and I just want something that works, and VSCode fits that bill, not just perfectly, but with flying colors to all of my other requirements.