Not sure the spinosaurus would have "won" against a T rex because he couldn't have stood up on his 2 back legs for very long. His best bet would have been to get a T rex leg or jump up and try to land on him and get him to the ground and use his arms. Not sure the spinos jaw would even handle a big predatory beast like T rex. Looking at the jaws in the museums and seeing the BBC dinosaurs shows, it seems that the spinos jaw would just break in a fight if he did fight a T rex and get a hold of him. His jaws were made to trap fish not rip flesh or break bones. The T rex, wether scavenger or Hunter would be able to easily crush any part of the spinosaurus. Plus on land according to this new research the spino would have been and slow and heavy on land. Plus I saw a show saying that the way the spinos spines were attached to his vertebrae that had he been knocked over he would've been virtually immobilized. Fun scenario, will never know sadly. But bigger doesn't mean tougher though. Both these dinosaurs are awesome!

its my new current event