I'd strategically vote for the SPD to humiliate the CDU and to vanquish Angela Merkel, who I continue to despise, despite the many exhortations from the New Yorker or the Atlantic that tell me that I should support her because she's #WokeLiberal or whatever.
Die Linke is filled with former Stasi agents, no thanks.
Greens? Um, no thank you, I don't aspire to be a lifestyle left-liberal.
I don't see how that's "strategic", seeing as how SPD are obviously the best choice. And my vote too. I'll say this though, the German Greens are a great example of what Green parties SHOULD be like, unlike the kooky freak shows they often end up as.