There are a few difference between them: ~Bull shark: Their diet consists of fish, dolphins, sea turtles, carcasses, etc. ~G.W.Shark:They eat seals, dolphins, white carcasses, elephant seals, etc. They rip off the chunks of meat and swallow without chewing it. ~Bull shark:They cruise in shallow waters, but spend most of their time in freshwaters, which gives them the name 'freshwater whalers'. ~G.W.Shark:They are found in oceans and shallow seas. These sharks are commonly found on the coasts of California, Australia and South Africa and in all cold temperate and tropical coastal waters.