Supercardioid polar pattern is narrower than a typical cardioid and allows a higher level of cancellation. Such microphones are thus used for a more focused recording and particularly for the reinforcement of a live sound. The use of supercardioids also allows achieving a better isolation while minimizing the bleed between two nearby sound sources, such as a singer and his own guitar or even two different drums in a set. Nevertheless, a reduced angle inevitably results in added sensitivity to the sounds coming from the rear. In case with supercardioids this isn’t particularly prominent, yet should still be taken into account.
More information about polar patterns!