The best replacement for enthalpy is entropy.

The best alternatives to enthalpy are rated as following:
★★★★★  entropy
★★★★  internal energy
★★★  temperature
★★★  energy
★  free energy
★  heat of reaction
  specific heat
  jwt
  internal energy when to use
  enthalpy of formation
  specific enthalpy
  heat capacity
  heat of formation
  dry bulb
  heat of fusion
  change in entropy
  nistune
  gibbs free energy
  vaporization
  latent heat

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Speaking about enthalpy, one probably shouldn't forget about heat capacity.

Other search terms related to enthalpy and their ratings are:
★★★★★ heat capacity
★★★★ entropy
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enthalpy
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