With Bitcoin you can run a full node and nobody ever will be able to steal your bitcoin.
Regarding Gold: you can desposit your gold in Bank of England and still they can refuse to give you such gold.
This a huge difference in favour of bitcoin.
This is why you should run a Bitcoin full node (follow my guide in signature if you can speak Italian).
Putting your gold in someone else's possession be it a bank, vault or security box is the same as holding all your crypto on an exchange. It introduces another element of 3rd party risk.
The safe way is to hold your own private keys and hold your own physical gold.
I would be amazed if there was anyone on this forum with so much wealth they couldnt easily hide it in the form of gold in their own house considering how value dense gold is. $40k gold is around the size of a smart phone, how hard is that to hide.