China. China. China. The answer is China.
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At least in America if you’re not a fan of the Trump administration we’ll have another leader in a couple years. You can’t say the same for China.
Brain drain from the US will be a dispersion that will hurt America but not meaningfully help any single country directly. At least in the short term.
But China has a lot to gain from a weakened America simply by being the best positioned, most aggressive secondary power.
Of course you’re right that an individual emigrating from the US to China is economically net-negative for that individual except for in very unusual circumstances.