Is Getting your little sister dressed for school is more complicated than a rocket launch a simile or a metaphor?

The phrase "Getting your little sister dressed for school is more complicated than a rocket launch" is a simile. It uses "more complicated than" to directly compare the complexity of dressing a little sister to that of a rocket launch, highlighting the challenge in a vivid way. Similes typically use "like" or "as," but in this case, the comparison is still clear and effective.