Example case:
I usually close voted specific cases on SO using this question as exact duplicate. Some days ago, the exact duplicate I usually used was closed itself using another exact duplicate.
But imo, the former duplicate still does explain the problem and the solution better than the latter.
Shall we (always) use the exact duplicate we think has the better explanation, or shall we (always) use the very last given exact duplicate in a chain? And/or vote to reopen the former duplicate? Something else?
Is there any rule describing what are we supposed to do in such case?