If asked this question during your interview, your interviewer is likely looking to see whether they're your top choice, how they compare to the other companies you are interviewing with, and if you are under a timeline. Feel free to talk with the interviewer about your search so far, and don't hesitate to let them know that a role with Allstate is at the top of your wishlist. Honesty is always the best policy with this question, and it always puts a little fire under a hiring manager if they're aware that you're actively looking for a new position.
The interviewer will have a folder with all the resumes of the candidates they are interviewing and their questions and notes from each interview, which they'll refer to later when making a decision. You should have something similar for all the interviews you've performed. Detail, for your eyes only, what each of them has to offer and what you offer them. Have tabs separating your notes for each interview, with a breakdown of the pro and cons of each employer. Having this with you will exude yourself as an organized professional, taking all your prospects seriously, and help market you as a viable candidate.
