This is a matter of personal taste. If it is just for yourself, please yourself.
There is much in what tex2002ans says about readability. By fiddling with text size and bolding the superscript some of these problems can be approached, but not fully answered, especially on smaller screen devices. On the other hand, the brackets are not as attractive.
I think there is no simple answer to this issue. If I were trying to do something for old codgers like me, though, I think readability would trump beauty every time!
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