no one knows what's the best next altcoin everyone is simply speculating about that you need to educate your self about the token dynamics before investing if you did'nt want to gamble in this market
Indeed, altcoin price movements no one knows where they are going, but at least for altcoins it will be easy to guess from how the platform develops because usually there will be FOMOs that will increase altcoin prices, so when you want to buy altcoins it's better to look at existing road maps.