What is the best cryptocurrency coin at this moment??

I would like to know the best coin to buy at this moment to get more financial gain.... The bitcoin was in cents may be 10 years ago and now in more than 10k$, would like to know some other coin which is still in early days and can grow like the bitcoin did?

BTW, how much more bitcoin can grow further?

I am looking for long term investment, may be 5 to 10 years. Appreciate your inputs. Thanks