Either silver or gold are not offically money now.

However, Silver has been used as money in far more contries than gold. China never used gold as money but we used silver, Great Britain started with silver as money, US monetary system favored silver over gold at beginning. There are nearly same amount of gold and silver above ground but silver is 55 times cheaper. In the turn of the 20th centry, government favour silver standard since it is easier to inflate. It can be increased quicker.

We never know what will become the money in the future. However, gold only seemed fail very easily, not sure why. Maybe it is too rigid. Bimetalic is more likely if the world will ever comes to a metal standard. But I am not counting on it. I like silver since many key industries depend on it. Even the world is not going to a metal standard, industry use is enough to squeeze the price. I don't want to list the uses.

If I am the government, I will choose paper first, silver the second and gold the last as money.