Gold is a true physical property that you can see with your own eyes or satisfy the weight of a gold bar in your hand. When you own gold, gold is still gold. You also do not have to depend on the Internet. Another difference of the gold is that it has been used as a place to store value for thousands of years. A gold coin is still in your pocket whatever happens.
Meanwhile, bitcoin is nothing but a line of code that exists anywhere on the Internet. You can not handle it, you can not cast the bitcoin into your pocket. If you lose the code, you will lose bitcoin