There is a world somewhere between reality and fiction. Although ignored by many, it is very real and so are those living in it. This forum is about the natural world. Here, wild animals will be heard and respected. The forum offers a glimpse into an unknown world as well as a room with a view on the present and the future. Anyone able to speak on behalf of those living in the emerald forest and the deep blue sea is invited to join.
I think that if we use modern animals, we can see that a crushing bite is better than just a slicing bite. T. rex have the most powerfull bite among dinosaurs, so he will need to bite the skull of its prey and that is all. Certainly, Giganotosaurus do not have that advantage. T. rex is more massive than Giganotosaurus, this discussion started by DinoFan83 is over even before it started.
By the way, I digged more and found no evidence that biggest Mapusaurus was even close to the weight of the biggest T. rex, so Franoys is right. Most reliable sources says that they weighed less, and just the biggest Giganotosaurus specimen (the little piece of mandible, and with a lot of speculation) barely reach the figures of T. rex.