Sharks are very useless. Hammers are very useful. Therefore, hammers are better than sharks. Let's make some comparisons.
Need to hang up a painting?
Hammer: Drives a nail into the wall so the painting can have something to hang on.
Shark: Will bite the painting, then it will bite the wall, then it will bite your arm off. So there was really no point in paying to have the painting framed.
Need to remove a nail?
Hammer: Removes nails.
Shark: Swims by the nail and ignores it. Snob.
Need to fit something into a portable tool box?
Hammer: Fits in the tool box.
Shark: Eats the tool box. Perhaps a baby shark could fit in the box, but then you're just stuck with a fish inside of a tool box.
But what about swimming? HA! I got you, [Glutton], I got you SO GOOD! SHARK WEEK 4EVER IT IS THE BEST THING THAT EVER HAPPENED IN MY ENTIRE LIFE OMG OMG OMG!
So HA, shark fans! I got you SO GOOD! SPARK WEEK 4EVER!