You just joined, but I will relate my experience in case other ET members
need to deal with arbitration. My experience is with American Aribitration
Association on a software contract dispute that I won a large award from.
I think my experience applies to your case as well. Look at possible arbitrator
resumees. Look for conflicts and experience. The legal system sort of makes
people into automatons so a lawyer who has represented brokers will think
the broker way.
Another hint, after narrowing down the list, ask your lawyer to tell you
the arbitrator's track record. Your lawyer will know from word of mouth
if nothing else, but you may need to be insistent to get that information.
Mostly I think arbitration is a pretty good except if one has a good case,
where it allows the other side to stall for years.