My current flow (has changed over time). I build initial prototypes in Figma largely because it's what I'm used to from working with Engineers, and our designers use it. It's also easy to share with others for comment. I could code the email at that point, but I tend to build the first draft in Braze Drag and Drop as it does a really good job of automatically adding all the HTML to get difficult email clients such as Outlook to display well. You could easily stop there, but I always download the HTML so I have a record of it outside of Braze, that I can work with and tweak in VS Code, or use elsewhere.
TL;DR design outside Braze, build inside. Use the best tool for each step.
