The people, the amount of female architects and deisgners at the firm, the mentorship experiences, the ability to experience different aspects of the workflow, design process, etc.
What I wish was different
I wish I had lived closer to make my own commute easier.
Even if you don't believe you are prepared, you need to jump in and accept the possibility that you don't know everything you need to know but that you will learn it eventually. Most likely on the job, especially if you aren't afraid to ask questions.