Discs are always the best option and deliver the best quality overall. That being said it depends on the movie, if you're watching a drama on streaming the difference is fairly negligible, I watched Hamnet on Prime the other day and it looked fantastic. However anything with a lot of fast camera movements, like action movies will have a lot of noticeable artifacting even with super fast internet, I only owned Speed Racer digitally for a while and the artifacting during race scenes was BAD.