Why Spinosaurus is considered weaker then Tyrannosaurus Rex?

Answer 1

Spinosaurus was likely more adapted to fishing than fighting. If the two ever could meet, it was unlikely a fight would have broken out however. Tyrannosaurus was more adapted to killing, with a bone crushing jaw, unlike Spinosaurus's long, and thin jaw. The only weapons Spinosaurus may have had against a dinosaur like T-Rex would probably have been its strong arms tipped with large claws.

Answer 2

Spinosaurus had long, narrow jaws with non-serrated, interlocking teeth, both of which were adaptations for fishing. Its jaws weren't strong enough to dispatch large prey animals. Tyrannosaurus, on the other hand, had the strongest bite force of any animal known to have ever existed, generating 3500 to 5000 Newtons of force in its back teeth. They also hunted large dinosaurs and even dangerous prey such as Edmontosaurus and Triceratops. That is why Tyrannosaurus was stronger than Spinosaurus.