The answers to the question of which currency pair is best to trade are quite subjective and they depend on one's preferences, expectations and expertise.
Surely, the safest way to trade forex is to trade majors as everybody knows that they are the most liquid and volatile on the market. Moreover, the are the most studied forex financial instruments. I mean that it is easy to find the information about EURUSD rather than other pairs. However, I think that every trader should aspire to learning minors and exotic pairs as well. It hink so because of the fact that they have greater potential profits and if you can comb the high risks, your trading will be much more profitable than ever.
I, for one, see lots of opportunities in RMB. I feel that this currency hides lots of different perks as Chinese economy is developing at incredibly fast pace and we should be ably to get benefits from such a development. However, I shouldn't forget about the risks which are associated with Chinese developing market. There is much uncertainty and unpredictability there, but I am learning how to analyze the market in the most efficient and precise way, so, wish me luck.