Which is the best currency in which we should keep our live trading account in?
I mean the currency who decline is the least possible f all currencies.
I have my account in my local currency. I live in Australia and my account is in AUD. This makes it much easier to deposit and withdraw funds. If you have in a currency other than your local currency there would be a poor conversion rate to deposit and a poor conversion rate to withdraw. Otherwise if you are asking about investing your account money, then very few people would risk more than 2% on any given trading decision. So you don’t look at converting your whole balance to any one currency.
It would totally depend upon the currency pair that you are comfortable trading. Just like trading style, not the same currencies will rock every trader’s boat.