I suggest trading with the USDJPY currency pair because its spreads average 1.4 pips during the day, or the EURCHF with 1.5 pips.
I personally prefer using the EURUSD currency pair because the spreads are tighter and provide enough volatility to offer value to most day traders.
Since I trade volatility and momentum, currency pairs that are the most liquid feature lowest transaction costs that's why I'm forced to set my choice on them. Otherwise I would try others too.
the best currency pair is a pair which has most lowest trading spreads which is supportive to predict the market.
lowest trading pair is very supportive to bring profit by scalping that brings profit in a short time.