not so much something as something idiom
与其说是…还不如说是…
If you say that something is not so much one thing as something else, you mean it is more the second thing.
They're not so much lovers as friends. 他们与其说是恋人，不如说是朋友。
I don't feel angry so much as sad. 我感觉与其说是愤怒，例不如说是悲哀。