The best replacement for 44 mag is 45 colt.

The best alternatives to 44 mag are rated as following:
★★★★★  45 colt
★★★  454 casull
★★★  357
★★★  45 acp
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★★  44 special
★★  45 long colt
★★  30-30
★★  45
★★  454
★  45lc
★  50 ae
★  41 mag
★  10mm
★  45 lc
★  30 30
★  50ae
★  45-70
  45 70
  444 marlin
  44 rem mag
  460
  35 remington
  .357 mag
  .44 special
  454 casull ballistics
  50 cal
  460 s&w
  500 s&w
  480 ruger
  smith & wesson 44 mag

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44 mag
45 colt
454 casull