The most probable reason i can think of about why people say gold is still better compared to bitcoin is the fact that gold has form. It's physical, tangible and precious that has been around for the past several years. Bitcoin on the other hand is still quite new and i bet if you asked any random stranger on the street a about bitcoin, i can say that not many will be able to know about bitcoin(as what i have experienced). Try to see both like this: Think of a doomsday/apocalypse like scenario. Since gold is physical, it will still be there whereas bitcoin being digital, will disappear with technology.
The most logical reason because gold has the beauty that is liked by people around the world as decoration and in ancient times people use gold as a currency so do not be surprised if many people prefer gold than bitcoin. But in terms of superiority bitcoin better than gold because of the rise in bitcoin price is very high but many people do not understand so many still choose gold.