Well, de-facto may be a strong word for what I meant, as everybody has their own way of doing things.
For me, appealing side of react + flux for me is it's simplicity. Adhere to the few principles of them (one way data flow, no permanent state in components etc.), and you have a scalable architecture in your hands, with little to no magic on the data side.
Haven't used marty yet, and since I've already developed what marty offers on my own app already I don't plan on using it soon, but from what I read in the docs, it doesn't try to do too much, or make too many decisions on your behalf. It offers more structure than a barebones dispatcher, without getting in the way. And in my experience, that is a really efficient and scalable way of building complex apps.
