The best replacement for decode is case.

The best alternatives to decode are rated as following:
★★★★★  case
★★★★★  encode
★★★  nvl
★★  case oracle performance
★★  case performance
★★  case statement
★  coalesce
★  case oracle
★  iif informatica
★  encode python
★  case which is faster
★  nvl2
  case oracle sql
  iif
  case sql
  nvl oracle

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Speaking about decode, one probably shouldn't forget about nvl.

Other search terms related to decode and their ratings are:
★★★★★ nvl
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