Bitcoin is no doubt a big coin and can be win earn big profit by investing in it. But i thinl investing in small and lkwer price coin will give big win than big coin.

Assume BTC at 2018 - 5000$ now at 38,000$. Its like almost 8x. Assume etherum
 2018- 100$ and now 1600$ and its 16x

So it is always higher profit with lower coins than higher ones.

Because potential of  double the price is for 1$ coins is possible than 50$ coin