The best currency pair to trade during the day can vary depending on market conditions and your trading strategy. However, some of the most actively traded and liquid currency pairs during the day are the EUR/USD, and GBP/USD.
What characteristics have you noticed in the pairs you ended up trading (either in the past or currently still)?
traders should choose the pair which is more appropriate to the concept of trading that will be used , if love doing scalping should choose the broker which allows trading concept such as this.
after having low trading spreads pair the result of scalping can be useless if there is no perfect money management.