This all depends on your unique criteria, such as the country you are based in, the types of instruments you wish to trade with, and the amount you are looking to deposit.
If you are subscribed to the GMT Membership, we recommend using the same broker as our Head Trader, John Fortune.  If you wish to get the most from the Pro Scorecards and Daily Video Analysis, it is important to select a broker that offers a wide range of instruments to trade.
You can open an account by following this link: Open Trading Account