no doubt this is the best partner but every couple will have their own unique and usefulness so this is why you can choose what suits you and you do not have to worry whether you should trade with the best partner or not and you can choose another pair as well . So every merchant will have different methods and this is why the differnt pair too. but EUr / usd is the best, no doubt and the EUR / USD currency exchange pair is actually one of the most comfortable forex trading pairs to trade. It has tight spreads and high volatility so it is generally a good partner to trade with.