there is two kinds of brokers in forex. One is the dealing desk and the other is a non-dealing desk. Dealing desk broker execute your request with requote and dismissal. To choose the right brokerage company you need to understand how different types of broker works. And before choosing you need to know their difference.

You cannot really say that one type is better than the other as in reality different brokers suit different traders' needs and preferences. Dealing desk brokers tend to be more ideal in case you are still quite new to forex or have been trading for just a few months. This is also referred to as a market maker. This is generally quicker and more efficient.

In fact you can never know how your broker actually works if only he makes obvious slippages on your account. Most of regulated brokers use hybrid model when some account trades executed inside of broker and some are not. Choose UK or Australia regulated broker and be happy.