The best replacement for .357 is .45.

The best alternatives to .357 are rated as following:
★★★★★  .45
★★★★  .38
★★★★  .40
★★★★  9mm
★★★★  .44
★  .38 special
★  10mm
★  .45 colt
★  .44 magnum
★  30-30
★  .357 sig
★  .357 magnum
★  .380
  .358 for 38 special
  9mm stopping power
  .40 s&w
  .40 cal
  .44 mag
  .38+p
  .45 long colt
  30 30
  45 long colt
  .41
  9 mm
  .358
  9mm ammo
  .44 special
  .38 p
  45
  10 mm
  38 special
  .38 revolver
  .44 recoil
  40
  .327

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

Other search terms related to .357 and their ratings are:
★★★★★ .38 special
★★★★ .38 specials
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