It also depends on whether you are doing a short or long term trading method. Usually if you do short term altcoins are the right choice, but you also need to select altcoins that often become a trend and can invite profits such as ETH, BNB, ADA, and others. There are still plenty of great altcoins for you to choose from right now. But if you use the long term method, Bitcoin is the right choice because Bitcoin doesn't show sharp ups and downs every day, only for a while it happens but in quite a long time as well.