Why Cross Currencies are Attractive

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Cross currencies are attractive because they represent currency pairs from culturally and economically similar countries; imbalances between these currencies therefore often return to equilibrium. It is hard to fathom, for instance, that Switzerland would go into a depression while the rest of Europe merrily expands. The same sort of tendency toward equilibrium, however, cannot be said for stocks of similar nature. It is quite easy to imagine how, say, General Motors could file for bankruptcy even while Ford and Chrysler continue to do business. Because currencies represent macroeconomic forces they are not as susceptible to risks that occur on the micro level - as individual company stocks are. Keep in mind, trading currencies has a high level of risk and is not suitable for all persons.
Source: http://www.investopedia.com/articles/forex/05/062205.asp