It's hard to say what effects a top-down adoption of either belief would have on people's worldviews, let alone the well-being of society. For society, I think it's much less important what people believe in terms of the origin of biological diversity than how they came to believe it. Now, if evolution were accepted from the bottom-up (meaning everyone understood and accepted the science behind it) then we might be better off as a society. Accepting the rational, evidence-based approach to knowledge used in science (and which leads to the acceptance of evolution) might leave us less prone to conspiracy theories, pseudoscience, and political manipulation. This would make us better-equipped to collectively make better decisions as a society.
Creationism, on the other hand, requires a rejection of some very basic principles of biology, archaeology, paleontology, and even astrophysics. If we buy that scientists across multiple disciplines are seriously mistaken -- or worse, conspiring to deceive the public -- we are apt to believe all manner of wacky conspiracy theories and old wives' tales, which at best would be a waste of our time and at worst could get our species completely wiped out(looking at you, climate deniers and anti-vaxxers).
Now, there is the tangential possibility that some people are only clinging to sanity by their fingernails, and if they were to accept evolution as true it would unravel their worldview so dramatically that the existential implications would drive them insane. There are some in this thread who seem to believe that materialism and moral nihilism directly follow from evolution. I will say that it's better for these people to keep on believing in creationism. But generally, a society that as a whole accepts evolution has at least one fewer conspiracy theory than one that doesn't. And that's a good thing.