USDJPY and GBPUSD brings me alot of profit during NFP and FOMC news releases. I prefer them actually. I sometimes scalp the EURUSD at Forexchief broker using a scalping EA. It is a good platform for such EAs.
My favorite pair of currencies are the exotic ones, since the handling of these is not done by many users and the value of these goes up and down constantly, therefore it is very dynamic and functional to make frequent movements and can make significant gains depending on the state of the market.
I personally like both EURUSD and GBPUSD. Actually I only trade these two pairs. I do not like to trade many pairs. But between EURUSD and GBPUSD I like GBPUSD the more. It is a wise idea to select one or two pairs for trading. It gives you space to learn all the trading patterns of that single pair.