I will choose them both but when it comes to longterm I will choose bitcoin bitcoin is a bit risky because the price falls fast and the price pumps fast but if only one is a weak holder bitcoin or altcoins I think there is a possibility of bankruptcy you are one of them but for me there is nothing to be afraid of if you know that bitcoin has the potential to hold you because bitcoin is a long-term investment and you should have a strategy and plan when you will buy it and when you will sell it.
bitcoin now looks preferable for the simple reason that it is becoming more and more popular for investments among various investment funds
which increases its price
other people look at the news from investment funds and start investing in bitcoin themselves
gold is also good for investing
but I like Bitcoin better