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I suggest that the capacitor that has the greatest stress is the one with the highest leakage independent of the applied voltage.
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I don't understand why that would be the case.
The big issue is not the leakage itself, but rather that with very low leakages the actual leakage values may be wildly different (but both still minute).
So if one capacitor has an ohmic resistance of 100Gohm and the other was only 10Gohm then the voltage ratio will be 11:1 and that is bad news if the ratings are both roughly half the applied voltage! (And note that it would take a very long time before you would notice).
What I am saying is that the actuality is not like that at all because the leakages are not at all ohmic, so it works better than one might fear.