For a long time; Ethereum has been the best altcoin which has been able to compete with bitcoin. LItecoin is also making its name in 2018 and is very much profitable for the investors who are interested to invest in altcoins.
This two has the potential of growing. This is the real profitable alternative. This coins will not failed your expectations. This will surely give you something in return. The thing you did not really expect. But then you meed to still be wise in everything.