The Spinosaurus was more powerful, ... The T-Rex devoured much larger and dangerous prey and had far, far more powerful bites. And it was certainly more robust. The Spinosaurus won't last very long against a being that outclasses it in all physical categories except for size ... More on comicvine.gamespot.com

No. By length, yes, but Tyrannosaurus was thought to have massed more due to its particularly chunky build, and weight tends to be more physiologically relevant More on reddit.com

I think the only reason the JP3 Spino was able to win was because (a) it was way overpowered; and (b) the T-Rex was underpowered by both being a young adult and by taking away both its trademark bite force and super strong neck muscles that we understand the real animal had. So even if biomechanically the Spino in JP3 could somehow get a hold of the Rex’s head to break the juvenile’s neck, which from what I understand is not possible notwithstanding the strength required and better scientific understanding of how the Spinosaurus looked since that film, a real (and presumably mature) Rex would be too strong, too tough, and too bulky for the Spino to try the same thing, whereas a real Rex would decapitate the JP3 Spino in a single bite. To be honest in the film the Rex lands the first neck bite and the fight should’ve been over right then and there irl but movie requirements meant that the bone crushing bite force of the Rex was reduced to that of a golden retriever that doesn’t want to let go of an old tennis ball. More on reddit.com

T. rex reks 11/10 FYI, Spinosaurus' anatomy was just revised VERY recently: http://miyess.deviantart.com/art/Spinosaurus-Revised-479151633 First off: Tyrannosaurus was a bone crusher. It didn't give a fuck where it bit down on its prey/rival, it would bite down with the force of 12,800 pounds PSI and absolutely obliterate any flesh, bone, and organs there. One decent chomp means its down. Spinosaurus is freaking destroyed. Now, this doesn't mean it wasn't a successful animal. It was primarily a pescivore, meaning it ate fish. Note the snout is perfect for trapping fish, with its curved premaxilla. Here's me personally asking Dr. Robert Bakker, one of the world's most renowned paleontologists, about this: http://www.reddit.com/r/IAmA/comments/29qwys/iama_we_are_paleontologists_dr_robert_bakker_and/cinutks Basically, Tyrannosaurus remains king of the terrible lizards. More on reddit.com