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The bigger of centrifugal pump net positive suction head NPSH value

The bigger of centrifugal pump net positive suction head NPSH value, the better or the smaller the better?
Net positive suction head is meaning the surplus energy exceed the vapour pressure for the unit weight liquid in the pump inlet. The unit of NPSH is Meter (water column).
NPSHa: device NPSH, also named available net positive suction head. The max value is meaning the pump hard to occurred cavitation.
NPSHr: pump net positive suction head, also called request NPSH or pump inlet pressure drop. The smaller value means the pump have good cavitation-resisting performance.
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