The best replacement for power factor is efficiency.

The best alternatives to power factor are rated as following:
★★★★★  efficiency
★★★★  load factor
★★★★  service factor
★★  phase angle
★★  ballast factor
★★  cos phi
★★  efficiency motor
★★  motor load
★  thd
★  apparent power factor
★  motor loading
  normal power factor
  motor efficiency
  displacement power factor
  harmonics
  lagging power factor
  dissipation factor

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Speaking about power factor, one probably shouldn't forget about load.

Other search terms related to power factor and their ratings are:
★★★★★ load
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power factor
efficiency
load factor