Good question RobertG. It also helps to know:
-Size of your account
-Do you need Portfolio Margin
-Average monthly volume
-Average order size(Some brokers have ticket fees)
-How important is customer support to you
Unfortunate, the answers to some questions might bring a few more questions. In general, if this will be a "small" retail account, I prefer TD Ameritrade for options. If it's more institutional, I can help.