The word "always" holds if we judge by fidelity to the original work. A careful dub is still a reinterpretation, layered between you and the creator's choices. Even an excellent voice actor changes accent, rhythm, and emotional temperature. For comedy, reading a line is fast, but hearing the original timing is the actual joke; subtitles give you both, dubs give you a substitute. Accessibility is a real concern, but usefulness isn't the same as artistic quality. A dubbed film is a different object. When we compare subtitles and dubs honestly, subtitles preserve the work itself, and that makes them better, always.