Crocodiles don't give a fuck, they will rip you to shreds, your dog, your cat, your cow, or you. Whats that in the river? Oh just a log, WRONG and now your dead
Sharks on the other hand, are just as scared of you as you are to them, you can fight them off easier and live, except maybe a great white. Also most sharks arent even dangerous, some are even cute. The only cute crocodile is a baby one.