The pattern ~でも~でも is used to present two (or more) alternatives and express that the same result or judgment applies regardless of which one is chosen. It translates to "whether A or B," "either A or B," or in negative sentences, "neither A nor B."
The most common use is with nouns, where it conveys that the choice between the listed options does not matter.
When combined with a negative predicate, the meaning shifts to "neither A nor B."
The pattern often implies that the listed items are just representative examples, and that the statement applies broadly. This nuance is reinforced when followed by expressions like なん何でも ("anything") or どちらでも ("whichever").
While 〜~かから~か presents alternatives as a question or choice ("A or B?"), ~でも~でも emphasizes that all the listed options are equally acceptable or applicable. It has a softer, more inclusive tone, suggesting "whichever is fine" or "it doesn't matter which."