The best replacement for assembly language is machine language.

The best alternatives to assembly language are rated as following:
★★★★★  machine language
★★★★  c
★★★★  high level language
★★★  machine code
★★  embedded c
★  higher level language
★  c language
★  assembly
★  instruction
★  low level language
  c programming
  high level languages
  high level

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Speaking about assembly language, one probably shouldn't forget about attribute.

Other search terms related to assembly language and their ratings are:
★★★★★ attribute
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assembly language
machine language
c