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Does bull/bear market actually make a difference?
The main difference between a bull market and a bear market is due the "the leverage effect". http://www.princeton.edu/~yacine/leverage.pdf The leverage effect refers to the observed tendency of an asset’s   volatility to be negatively correlated with the asset’s returns.   Typically, rising asset prices are accompanied by declining   volatility, and vice versa. The term “leverage” refers to one possible   economic interpretation of this phenomenon, developed in Black (1976)   and Christie (1982): as asset prices decline, companies become   mechanically more leveraged since the relative value of their debt   rises relative to that of their equity. As a result, it is natural to   expect that their stock becomes riskier, hence more volatile. More volatile assets in a bear market are not such good investments as less volatile assets in a bull market.