Damage wise, I think the croc can inflict more damage if u are
caught in it's jaws.
However, if we take into account the environment, I think u can
have a higher chance of survival when attacked by a croc!
why?
Croc's natural habitat: River/swamp
Escape option :Swim to the river bank and run for your life.
Shark's natural habitat: Deep sea/ ocean
Escape option: NIL (unless a passing boat/ship rescues u...it's too
far for u to swim to shore )
Also, do note the hunting "habits" of both predators.
Croc: Usually stalks the prey slowly first and only speeds up when
it's quite near the prey. Also, they have a habit of mauling the
prey and letting it die first before eating it. sometimes the croc
leaves the "dead" prey unwatched, which gives it the chance to
escape.
Shark: Swims at full speed at the prey and bites it! Will not stop
until it is finished with its meal. Seldom stalk its prey when its
in the water. (might follow some ships in hope of catching a quick
bite )
Verdict: U will have a higher chance of survival during a Croc
attack! 
opinions? 
