Giganotosaurus vs Tyrannosaurus who will win?

We cannot know for sure, but T-Rex had a slightly stronger bite force, but Giganotosaurus's bite was also very powerful. Giganotosaurus was a little bigger, but Tyrannosaurus was probably a little more muscular. Either of them could win, because it is a 'whoever bites first' scenario. Whichever dinosaur decides to bite first will most likely be the winner.