The main draw of the Unity Editor for us is how it auto-reloads assets, like 3D models, as soon as the asset file is updated. So the workflow is having your DCC app open in which you model things and export assets from, and Unity Editor to design your level where every model is always up-to-date.

This is not possible with Blender because it contains all models inside a single .blend file, so assets must be manually re-imported each you change them. There is a Link feature in Blender but in my experience it's not as good as what Unity does out of the box.