As only banks can participate in this type of broker, it is not suitable for beginners. If any other broker grants you direct access to the Interbank market, he does not play fair as the market is not open to individual traders. Furthermore, institutional brokers have direct access to the market and represent 50% of all Forex trading.
Now you can see, that only four of the five mentioned markets are open for individuals. From these four, the Retail market maker is the most appropriate one. Within this type, there are a lot of different types and they are easy to find. However, one must take a look at the services provided by the broker he selects. But don't chose a book maker or bucket shop, as they are illegal.