The best replacement for r value is u value.

The best alternatives to r value are rated as following:
★★★★★  u value
★★★  k value
★★  u factor
★★  thermal conductivity
★★  r squared
★  k factor
★  p value
★  thermal resistance
★  heat loss
★  thickness
★  thickness insulation
★  cbr
  thermal mass
  l value
  energy savings
  lttr
  rsi
  r value
  thermal value

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Speaking about r value, one probably shouldn't forget about insulation.

Other search terms related to r value and their ratings are:
★★★★★ insulation
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r value
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