Gold and silver are the classic precious metals. If you want to buy these to hold, as physicals, long term, silver has the advantage of being cheap to buy in small amounts. Gold has the advantage of being physically smaller. As far as trading silver or gold goes, there is little difference as the differential in gold/silver pricing changes with the mood of the market so it's anyone's guess which will outperform the other in the long term. Over history, gold to silver ratios have changed from 5 to 80 in terms of how much more times gold is worth an ounce; although 16 to 40 times is the modern range. Recently, silver has been the most volatile which suggests silver should outperform gold but this argument is a technical one and most people will select silver over gold because of the satisfaction of owning kilos over ounces, or its practicality as money in extreme times.