Lately I've been watching people on this wikia and YouTube argue over whether Spinosaurus actually could beat T-Rex in a fight.These ridiculous debates usually consist of pridefull Spinosaurus fanboys and butthurt T-Rex fans. Both sides claim to be diehard JP fans as well, but I find that hard to believe.
A true JP enthusiast would recognize and understand that Chaos Theory plays a major part in almost every aspect of life, especially in a fight between two monster lizards. The fight would depend on factors like the size of the competitors, overall health, experience with fighting, and even the environment.
So basically, there is absolutely no way for anyone to tell whether a Spinosaurus could beat a T-Rex. All the tiny variations in the world ensure that the outcome is always unpredictable. The essence of chaos.