If you're in the South, I think it's a legit choice. The two have very different properties so you wanna think abot what you want.
If you're somewhere that is freezey for long periods of time in the winter, I do not think sand is a viable option for inside your coop, as it will a) freeze solid and hard (with poo freezing *to* it, if it's especially cold for long enough), and also b) be exceptionally cold and frostbite-creating on the poor little chickens' feets.
JMHO,
Pat