Broker is a middleman between the two parties of a currency exchange trade, i.e. the buyer and the seller of a currency pair. So it is important to select a reliable broker. Since the best companion in the forex market is your trading platform. I will say that select your broker after all sorts of necessary inspection. For me AAFX is my most reliable broker as it is providing me low and fixed 1 pip spread, high leverage of 1:2000. And as a scalper I am happy with its services.