Which variant of creationism is least adapted for survival?
Before I answer this question, I must point out that the theory of evolution as a whole is more likely to die out in a blink of an eye than creation myths. Everybody knows what a tv is, but only a few people know how it works or how to build one. The theory of evolution... science as a whole is like a super structure that can potentially collapse at a moment's notice. All it takes is another collapse of civilization like the ones we have observed in the past.
Creationism, on the other hand, does not require any kind of learning or thinking. Like all other creation myths, all it takes is a person to tell a story to a child and the tradition is passed on.
In other words, all the so-called "creation science" stuff that have sprung out of the original creation myth are most likely to die out first. As to the rest, I don't care if we have a nuclear holocaust tomorrow, the 6 days creation account will continue to live on.