Huh.
I don't hate HTDAAB's cover as others here. I was only 13 when the album was released and my feelings are kinda still the same. I didn't like it very much, but their attempt to look cool kinda worked on me as a teenager.
SOI's cover is a better photo, also more impactful, but it also looks out of place despite the obvious meaning, so I don't think it's great. Btw, I liked SOI's temporary cover that came with Apple's release. It looked proper... but it was probably too ugly for the physical release.
To answer the thread, it's basically a tie to me, but I voted in HTDAAB as the worst cover.