The answer to almost every perennial "either, or" question is fundamentally "both."

The "perennial" qualifier is important.

If it's not an enduring debate between different sides, then maybe the answer is simply one or the other and we just don't know which yet.

But if the debate has been going on for a long time, the longer it's gone on without a definitive answer, the more likely the answer is definitely, "both, with the ideal mix between them something that varies in different contexts."