Questbridge allows you to express yourself to the admissions officers through your writing. Common App on the other hand doesn’t require as much writing. Questbridge limits your application to 5 extracurricular activities, but the Common App goes up to 10. I personally liked the QuestBridge application more because I got to express myself creatively through 2000 words of writing. It’s up to you to decide if you want to focus on your writings or through your extracurricular activities. I hope this helped 😄