As BiggerPo said earlier, interview with all of them if possible. If you are new, try to go with a broker that has a great training program. Also, I disagree with what was said earlier. I don't think there is a company out there that will give you the benefit of "laying back" while the name of the company sells for you--you've got to work hard no matter what company you go with.
In my experience, the name itself is going to do very little for you in a competitive situation, where you are up against several other agents for a listing. This business is all about selling yourself.
In summation, interview with as many as possible and go with the office that you feel you fit best with. See if you like the energy in the building, the marketing the company does, the broker's willingness to help,fees, and other misc. benefits [ex: 401k matching].
Good luck, work hard, and don't forget to hold yourself accountable! Your only reason for you not succeeding is yourself.