It would not be a correct sentence to say buy any cryptocurrency. Here, solid cryptos are generally discussed and mutual ideas are compared. In order to invest, it is necessary to analyze the right project correctly. Currently, the popular coins are the most stable.
Or should we say, the top alts have the possibility to exist longer. Because it depends on the foundation itself of the project, whether it can survive or not. As we have seen, a lot of alts already disappeared in this market. Only few are worth investing at. And besides, before you go to other alts, you can always include bitcoin in your portfolio. In this way, you are holding the top currency, which has better chance of surviving as compared to most alts.