This can't be a serious question.
Antony was a CGI ant with no motivations or personality to speak of. His death was mostly offscreen and basically played for comedy. Also it's a Marvel Studios movie, so he's probably not actually dead.
Storm was an actual character with motivations and a point of view, who had meaningful interactions and relationships with other characters. His death was onscreen and horrific, if a bit cheesy.
Dr. Storm was one of the better elements of the film.
Exactly how many of these "Was THIS crappy movie/moment worse than F4NTASTIC" threads do there need to be?