If they don't like fast/scary rides then Tower of Terror and Rock N Rollercoaster are probably out. Which makes DHS far less appealing. If those rides are out, unless your kids are huge Star Wars or Toy Story fans, I would think that Epcot is the better option. Even the "thrill" rides there (Test Track and Soarin') are tolerable to most people and they are at an age where they can really appreciate the countries in World Showcase. Illuminations vs Fantasmic! is a wash. I prefer F! but wouldn't base a park decision on the night time show.