Bitcoin is always a great investment, very interesting and the leading coin of crypto, in short, people rely on bitcoin more than any other coin, so if you only plan to invest in trusted money, it's safer than investing in a new one.
Bitcoin isn't always a great investment due to the volatility, you can ask them who invested in December 2017 and have to withstand the capital loss, many people have cut loss and some choose to hold it until these days, probably still waiting for the next ath to cover the loss for 3 years. Nonetheless, for investors who can wait for the long term, Bitcoin indeed is a good investment.