We do not have any preferred brokers that we recommend since each brokerage firm has their pros and cons. Here at Option Genius, we use TD Ameritrade's ThinkorSwim platform. We also autotrade with a few brokers, like eOptions and Interactive Brokers.
Choosing your broker is one of the most important parts of being an options trader and it shouldn't be done on a whim. You need to take your time and really research brokers.
As a trader, you can't do anything without your broker, so chose wisely.
Remember, it is not all about the commission. If you are new to options, or trading in general, you may want to go with a broker that is a little more hands-on in helping you learning their platform