Giganotosaurus vs Diplodocus

giganotosaurus would just need to bite the neck of the sauropod. diplodocus may have that extremely long tail that could be used like a bull whip, but that's not enough to win, as its long neck is quite vulnerable to attack. giganotosaurus should win this.

Diplodocus carnegii would actually stand a chance if it were to be attacked from behind, in that the diplodocid would have had the chance to use the more robustly built base of its tail, seeing as the whip might have been used mainly for purposes other than combating with predators, since it would be extremely ineffective and unwise to use a whip, which is more well-built for causing pain, when a more robustly built part of the tail can be used to knock an attacking predator to the ground. I think using the face-to-face concept in those matches is extremely one-sided, since you are getting rid of an animal's ease with employing its unique effective defense, while exposing its main weakness to an animal that evolved to kill sauropods. An ambush scenario for this kind of match would be a lot more fair.

Giganotosaurus wins pretty much everytime if head to head