Are Portuguese man of wars more dangerous than sharks?

Yes, they are even more dangerous than bull sharks and great white sharks. Portuguese man of wars can produce powerful stings that can cause shock, fever, or heart and lung problems. On land if you see one, do not touch them because they can still sting you badly. In water, stay away from them. They can sometimes be found in groups of 1000 or more. The toxics from the portuguese man of war are about 75% as powerful as cobra venom.