I believe that Pearl Harbor was worse because American soldiers and innocent lives were taken. Also, America was not yet involved in ww2 and was not planning to mess with Japan. Japan did not have any, reason to attack America and take innocent lives.
The majority of people say that Hiroshima and Nagasaki were worse because of more destruction and lives were taken. 70,000 lives were taken at Hiroshima and 40,000 at Nagasaki. Some people say that japan had it coming because the attacked America