It is very difficult to say if it would be the best as long as there are numerous ways to invest money and they will depend largely on what the individual is familiar with; however, it is among the best, in large part to the fact that in contrast to market / residence actions — an investor can get money regardless of the least the way in which the instrument therefore makes sales / purchases of this instrument (or doing both things — known as hedging).
In the Market Exchange it is only possible to invest in the success of a share — however, in the currency that the two can acquire / sell a certain currency in front of another and therefore always and at all times there is a possibility that the advantages that were made.
Likewise, the fact that the currency is frequently traded on leverage, allows exchange operations to become among the most volatile and consequently leaves greater gains (and losses) than was made — if they have been traded properly.