Ignoring the tone of the other poster, the point they are making is that there is no clear value for indentation markers in a (unified) diff view, which is based around lines being removed and added.
Similarly, you might not even see braces for the corresponding block, so the braces-vs-spaces is not really a win for "braces".
However, I am guessing you are mostly using side-by-side diff view (as opposed to unified diff view), which might have some value to indicate indentation change for a bigger chunk of the code. But again, if you are not seeing where the block starts or ends with braces in the diff block, why is whitespace in any way "worse"?
Similarly, you might not even see braces for the corresponding block, so the braces-vs-spaces is not really a win for "braces".
However, I am guessing you are mostly using side-by-side diff view (as opposed to unified diff view), which might have some value to indicate indentation change for a bigger chunk of the code. But again, if you are not seeing where the block starts or ends with braces in the diff block, why is whitespace in any way "worse"?