Data Table properties vs. Document Properties - how to handle static values and changing values?

I have two types of values:

One set of values will remain static for every page of the analysis.

Another set of values will be open for users to change from an initial static value and will be available across the analysis.


(1) For the static values, which is better? Setting them as Data Table properties or as Document Properties? Why?

(2) For the values the user can change from an initial value, I don't want to just use a calculated value in a text area because then I would be forced to add that calculated value on each page of the analysis. So which would be better in this situation? Set them up as Data Table properties or Document Properties? Why?

Thank you,