Sandman Vs Mr. Fantasic

sandman's very, very durable too, and if he's nowhere near water or cement mix or something that makes rocks immovible, he's very hard to beat or contain

pretty much..

Sandman wins........Reed can't combat and beat a guy who has access and complete control over the Mojavie Dessert. Now if it were Plastic Man it'd be different. ✅

cuz no one can kill P-man, but he doesn't have an annoying jobber aura like supes wonderwoman, etc.