The best replacement for sig p238 is colt mustang.

The best alternatives to sig p238 are rated as following:
★★★★★  colt mustang
★★★★★  ruger lcp
★★★★★  p938
★★★★  kahr p380
★★★  glock 26
★★★  bodyguard
★★★  walther ppk
★★  glock 42
★★  p232
★  kahr pm9
★  kimber solo
★  kimber micro carry
★  colt pocketlite
★  bersa thunder 380
★  kahr
★  colt mustang xsp
★  bodyguard 380
  colt mustang pocketlite
  kahr 380
  taurus tcp
  s&w bodyguard 380
  bodyguard .380
  bersa thunder

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sig p238
colt mustang
ruger lcp