@Edvin,
Let me make sure that I'm actually speaking the right language, since both of these terms (as well as the phrase mythos over logos) carry a lot of luggage around with them:
The realm of Logos: logic, definition from qualities, "complete" equation, specific
The realm of Mythos: metaphorical thinking, definition from similarities, loose equation(verb not noun,) general
Logos would ask us to regard a new phenomenon unto itself. To define it's particulars and explain it's behavior from these particulars.
Mythos informs us through the shared qualities of various phenomena. It would have us apply our experience with other phenomena to the newly examined one.
If this is not what you mean then the rest of this post is likely irrelevant:
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Some more or less coherent thoughts:
I believe that mythos is the primary way we operate, in terms of precedence, and quantity both.
I think that logos is more expensive, in terms of "mental costs," and that we avoid it instinctively unless mythos doesn't bear fruit in a particular realm.
Interesting perhaps are those cases where logos is used to construct a mythos, which is then utilized dogmatically.
One problem with mythos is that it is not always apparent to us that it is not logos! The two are often so intertwined within the same argument that distinctions are difficult. Sometimes we need someone else to point this out to us.
In my own intellectual experience the two perform a sort of dance across the history of my internal dialogs.