Tron and Ripple are growing in popularity in last days and they are main candidates for becoming the leasers of crypto.
As for less known currencies, I hope
FuturoCoin will achieve success. They're already in good position and I wish them more successes like this sponsorship for F1
And of course Ether, if we counting it as an altcoin, its position as a second leader, just behind the bitcoin, is undeniable