The Jurassic Park Spinosaurus has a massive advantage here and wins maybe 9/10 times. The IRL Spinosaurus had skinny legs and a weak bite that couldn't handle a large amount of stress. The JP Spinosaurus, despite being smaller than the IRL one, has a larger bite force, superior durability (he tanked a Tyrannosaurus bite for Godzilla's sake) and was able to snap the huge, bulky neck of that very Tyrannosaurus with minimal effort. The Jurassic Park Spinosaurus is also fast AND semi-aquatic, but recent studies show that the IRL Spinosaurus wasn't made for swimming underwater (if I remember correctly) While the JP Spino apparently has no such problem. The Jurassic Park Spinosaurus also has long legs which are used to run fast on land. The Spinosaurus from Jurassic Park three has an immensely durable snout considering how thin it is, as it was seen to latch on to the neck of a Tyrannosaurus and hold it there, and then to snap it. JP Spino wins.
