Novice photographer, let me ask you a question.

The effect of automatic and manual should be the same in theory. Is it a personal problem? It's still manual. What parameters are different from those of automatic transmission? Then you didn't find it. ISO？ Or a comparison or something?

The aperture shutter is mainly adjusted according to the light to obtain the correct exposure, which is good. The other is that the aperture can control the depth of field and control the background blur; Shutter, as upstairs said, shoots running water, the shutter is slow, and the running water will have the effect of atomization.

Depth of field (blurred background): The larger the aperture, the longer the focal length, and the closer to the subject, the more blurred the background.