Like Bitcoin, Altcoins are also profitable. They are also based on the same concept as bitcoin based. In my opinion Ethereum, Ripple and Litecoin are some altcoins which are best in this time according to their market value and advantages. Ethereum is mainly good for long-term investment purposes because of its less volatile nature and it has a good market price too. Litecoin is best because if its safe and fast transaction facility and Litecoin also have better block size because of this its transactions cost are also low.