An attempt to compare Bitcoin to the dollar, gold, or stocks is an attempt to classify it according to the classification rules followed in precious metals, financial markets, and monetary currencies, which is a wrong classification, so it is better to consider Bitcoin as Bitcoin and include a new classification that includes cryptocurrencies due to its difference in essence from gold, stocks, and cash.
Thus, the answer to your question is that both are important. Just as you need paper money, stocks, real estate and investment portfolios, you need to acquire some cryptocurrencies.