I have traded 32 pairs at once and then narrowed down to just one and that EURUSD give you the volatility and clean price action too. EURUSD is the most widely traded pair in the forex industry. Also, if you wish for a clean price action and not so volatile pair you can check out AUDUSD.
EUR/USD is my favorite too. It has the smallest spread and there is a lot of information and analysis available on these currencies to make sound predictions on their value.
I recommend trading with EURUSD currency pair because their volatility is low in the market, and their spreads are smaller. With a good strategy and money management skills, consistent profits are possible.
I started with EUR/USD and other majors. But I am now working hard to learn to trade exotic pairs because the fluctuations offer more opportunities to make profits.
Basically, I do recommend everyone to trade major currency pairs in order to reduce the possible risks associated with trading. These pairs are more predictable and well-studied, there are many educational resources which can make you improve your knowledge and skills in trading which is very important for a trader. However, I still think that traders should also study some minors, at least a couple of pairs. From my perspective, minors have bigger potential profits. I would like to point out that it doesn't make sense to start trading them if you know nothing about the economies and pecularities of the countries which they represent. You should study really hard in order to gain the rewards from the knowledge which are not common among trading community as a whole. You shouldn't forget about the risks. The trading strategies will be different from the ones which we got used to trading majors and you will have to create and test your own brand new strategies, but, in my opinion, the game is worth the candle.
I mostly prefer the EURUSD currency pair because they have the smallest spreads with predictable strategies and offer more opportunities to make profits.
I recommend trading with major currency pairs like EURUSD or JPYUSD since they have lower spreads and are predictable than other pairs.