The best replacement for shanks is mihawk.

The best alternatives to shanks are rated as following:
★★★★★  mihawk
★★★★  whitebeard
★★★★  akainu
★★★  blackbeard
★★★  whitebeard episode
★★★  luffy
★★★  gildarts
★★  kaido
★  doflamingo
★  rayleigh
★  garp
  kaidou
  ham hocks
  admiral akainu
  ideal standard
  newgate
  hocks
  veal shanks
  shivs
  white beard
  marshall d. teach

Your alternative for shanks is not listed? Suggest!
Speaking about shanks, one probably shouldn't forget about mint gravy.

Other search terms related to shanks and their ratings are:
★★★★★ mint gravy
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shanks
mihawk
whitebeard