The best replacement for cagr is irr.

The best alternatives to cagr are rated as following:
★★★★★  irr
★★★  aagr
★★  xirr
★★  agr
★★  annualized return
★★  geometric mean
★  total return
★  average growth rate
★  absolute return
★  growth rate
★  average annual return
  carc
  yoy
  year over year

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Speaking about cagr, one probably shouldn't forget about rate function in excel.

Other search terms related to cagr and their ratings are:
★★★★★ rate function in excel
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