While I do agree that subbed is the definitive way to watch any anime or foreign show, I watch dubbed if I want to connect to the characters more. I mainly only watch dubbed for romance genres, and I watch subbed for anything else.
Plus, where I am learning Japanese, subbed is such an amazing tool for comprehension. I don't mean to reiterate, but subbed is better imo, I can understand why some people watch dubbed only.
Edit: I was thinking about younger audiences or ones with reading disorders, and I can totally understand why they watch dubbed.