BTC Gold does not bear any quality losses and does not degrade over time. It is a durable material that exists on the Earth exactly in the quantity in which it was mined initially.
Bitcoins can be destroyed, but for this special conditions should be created during its mining, which so far, fortunately, never happened. However, there is still a risk of losing coins. The media on which Bitcoin data is recorded may be lost, destroyed, etc. Despite the fact that the currency itself exists in a huge number of copies, it is still digital, which determines its dependence on technology and in the long term on technology. In addition, we can not say exactly what will happen to Bitcoin in a few tens or hundreds of years. So far this is only an experiment that the modern generation likes.
The winner in this dispute is gold, because it simply is and the conditions of its existence are also quite simple and understandable.