If DL shut its doors tomorrow, who would you move your FF program to? Or would you just fly whoever is cheaper/more convienent?

I don't want to debate if/when/should DL shut down, that's the subject of many threads on here already. I want to be informed about other FF programs in case I have to make that decision in the future.

So what airline would you move to and why?

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I haven't decided yet, but it would be between 1) AA and UN or 2) whoever gets me there the fastest/cheapest. AA seems to have better hubs for me and might be more convienent depending on where my 2006 clients are. (Dallas for one).