River Mitchem is your real name. Big mistake revealing it.T rex wins hands down. There is no doubt about it. T rex has a bite of 9,000 kilos.(9 tons)of pressure. Giganotosaurus only has a bite of 500 kilos. of pressure. T rex would crush the life outta Giga. Yeah Giga may have hunted colossal sauropods, but T rex took down heavily armoured dinosaurs like Triceratops and Ankylosaurus that would kill Giganotosaurus.