I think the best altcoin to minr is the waves coin because this altcoin for sure will increase in the future so if you mine this coin now you get a lot of waves because the price of this coin is very cheap and for sure in the next few years or months it will become hundreds dollars price . If you mine this hold it for few years to earn a lot of money. You can try this alsp ethereum classic, taas , qtum and komodo this 4 altcoin is cheap price less than 10 dollars price.