Who would win in a fight if Tyrannosaurus Rex fought Giganotosaurus?

i'd say tyrannosaurus because it had a much stronger bite force than giganotosaurus did. though it's possible for giganotosaurus to beat t-rex. but the might not have fought because t-rex lived in North America and g-rex(giganotosaurus) lived in south America. g-rex was a pack hunter. so 1 t-rex wouldn't stand a chance against a pack of g-rexes.