Neither :). I personally dislike expandable grids and grid inside the grid as a UI solution in general. I prefer overlay for this purpose, or sidebar panels. It is up to you what you use, generally if data is similar as the one in the grid, use expendable grid, here is an example https://w2ui.com/web/demos/#/grid/7
Please do not submit questions here. Stackoverflow, or the like, man!
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