Blood In the Water

You decide to pick your pants and fight the megalodon for your life. You look more carefully at the weapon options.

The shotgun is a gleaming beacon of awesomeness. It's a semi-automatic that has a capacity of 8 shells. It looks clean and ready for action.

The machete looks dumb and old. There's rust on both sides of the blade and it looks like it can't cut anything.

Which weapon will you choose?