The best replacement for .38 special is 9mm.

The best alternatives to .38 special are rated as following:
★★★★★  9mm
★★★★  .380
★★★  .357
★★  .38
★★  .38 super
★★  .357 magnum
★  .380 acp
★  .44 special
★  .357 mag ballistics
★  .380 auto
  9mm stopping power
  .357 mag
  .38 s&w special
  .380 acp ballistics
  .38 long colt
  .380 automatic
  .22 magnum
  9 mm
  .22 wmr
  .38 acp
  super
  .38 special

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Speaking about .38 special, one probably shouldn't forget about .357.

Other search terms related to .38 special and their ratings are:
★★★★★ .357
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.38 special
9mm
.380