41SkywardLink98Sun 10th Mar 2013 I don't believe there are any changes to the story if you go casual. I went classic normal, and I've saved every unit (though I had to reset multiple times). Grinding is easy as well, so you can overlevel your units and easily beat any level (except the Spotpass ones and the final level). My SD Card with the game on it is just as physical as your cartridge with the game on it. I love Nintendo, that's why I criticize them so harshly.