You should take into consideration that T rex was the "Einstein" of Theropods. T rex brain was almost double the size of Giganotosaurus brain. Giganotosaurus had a more "crocodilian" brain while T rex was more like a colossal flightless bird of prey. I bet on the T rex in that aspect. Another advantage of t rex is, that Gigantosaurus specialized on large sauropods as prey. That needs completly different tactics than a T rex uses to catch hadrosaurs. Giganotosaurus is very much the same size as a large hadrosaurus like Lambeosaurus. So it has the typical size of T rex prey. T rex on the other side is something Giganotosaurus does not fight regulary. I´m pretty sure T rex would kill Giganotosaurus. And just look that Tyrannosaurids wiped out any Allosaurids in Eurasia and North America in the late cretacious. Allosaurids could only be found in remote areas like South America, Africa and Antarctica / Australia, where no Tyrannosaurids could reach. So i think its a clear thing.
Ha! Agreed completely.
