The term Shark is used loosely on this site to mean the Great White Shark species and that also means that good ole Jaws is a part of the character. The Saltwater Crocodile is one of the largest creatures out there and they can grow to be around 23 feet, just two shy of the famous Jaws creature. Size isn’t everything though and both of these creatures have tremendous power at their disposal. One bite from either of them could be fatal and it’s a tough choice, but I’m going to have to lean towards the classic Great White. It’s pretty quick underwater and I believe that it would win a biting battle. Shark wins.
DReager1.com 
The saltwater crocodile has the strongest bite force of any animal in the planet. Their bite force is estimated at 7,700 psi, while the great white shark is estimated at 669 psi. The saltwater crocodile also has a more complex brain than the shark allowing it to process more information and the right moves in order to survive. There have also been reports of a single saltwater crocodile taking down a fully grown male elephant. And if you decide to use jaws then the crocodile can become Dinocroc.
Was that Crocodile a Saltwater version though? I forgot where the scientist picked the creature up from and I’m not the most knowledgable person about Crocodiles so it’s possible that I didn’t notice such a find. Sheer biting force is definitely a solid advantage for the Crocodile, but one bite from either opponent should suffice and the Shark seems to be a lot more maneuverable in the water.
Great white for sure. Better maneuverability, more lethal bite and being TWICE as large will spell doom for the crocodile.
Yeah, The Saltwater is just out of his league here