Narratively you often want to follow the inverted pyramid: put the answer first and then explain it.

That way, if the reader drops off at any point they've gotten the most bang-for-buck information.

Also a reader who already agrees with the answer can just drop off early, saving time.

But this doesn't work well for surprising questions.

If it's an answer to a question the reader didn't know to ask, or a non-obvious answer to a question they should be asking but aren't, then they'll bounce right off.

In those cases, spending just a few sentences setting up a question they likely have, that's evocative... and then giving them the surprising answer.