OP - You have two amazing options on the table. Congratulations!
I think you’ll be able to get a better sense of where you can see yourself after your accepted student days.
Not only is there a size difference, but the settings too. Even though Evanston is technically a suburb, it still has a very urban feel.
When you are on the two campuses, really think about where you see yourself fitting in the best and what feels most comfortable.
You will get an excellent education at either place. You can’t make a wrong choice.