My favorite coin until 2018 remains Bitcoin. But there are a number of Altcoins that I favor and buy coins too. There are several, namely Ethereum, Ripple and Litecoin. They are my top choice when visiting Altcoin, because they are currently my new favorite coin.
Surely that person's favorite coin differs depending on one's own comfort. of course the top 5 coins in the marketcap coin are the best-selling and many are favored.