It is also risky to store your big amount of bitcoin in one place, it is hard as storing a lot of gold. Hackers and scammers may find way to steal it. Gold is the best for long term investment as we can see on the price chart, its value is increasing as year goes by.
For me not only gold is best long trrm investment also bitcoin because we are waiting for the increase of the price and it take more time to make profit. But i think even we have 1 bitcoin wallet our bitcoin is safe until we do not disclosed to other our private key.