Piranhas and sharks are both fish, and they are very fierce fish. They are mainly carnivores and can take many animals around them as prey. Piranhas are better than sharks depending on the specific situation, whether they appear alone or in groups, and the types of sharks should also be considered.

Sharks are generally large, especially some very fierce sharks, while piranhas are relatively small, with a body length of only 20-30 cm. So, if piranha alone is more powerful than shark alone, it is still a shark. Of course, there are different kinds of sharks, such as "pygmy horn shark", which is only 6-8 inches long and may not be as powerful as piranha. Swarms of piranhas are very powerful. If piranhas are compared with sharks alone, they are still stronger. Their predation ability is very strong and they can eat very large animals. Another situation is that sharks are also in groups. Sharks are usually very powerful at this time.