The top 3 best altcoin I recommend you buy is Ethererum, EOS and Stellar. Ethereum is the queen of altcoin, it is very popular. Many big investors hold and believe in Ethereum. EOS is appreciated by many experts. In the future EOS is likely to become Ethereum's biggest rival. Stellar has a steady growth rate, its price is also pumping up quickly. I believe that investing in Stellar will bring you much profit in the near future.