C++ 100%.
- All logic in one place
- You can debug and/or detect errors by diffing files in a versioning system and not even having the editor or visual studio open
- Sweeping changes to game classes or variables? Its just a search / replace of text, easy
- Readability - a few lines of code can be equivalent of a screen full of blueprints
- Find all logic references to a particular class, function, variable, or asset? Simple text search.
- etc.