The best replacement for fuzz face is fuzz face mini.

The best alternatives to fuzz face are rated as following:
★★★★★  fuzz face mini
★★★★  big muff pi
★★★★  tube screamer
★★★★  muff
★★★  octavio
★★★  swollen pickle
★★★  tonebender
★★★  fuzz factory
★★  axis fuzz
★★  mxr 108
★★  hendrix fuzz face
★  big muff
★  double muff
★  fulltone 69
★  tone bender

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Speaking about fuzz face, one probably shouldn't forget about wah.

Other search terms related to fuzz face and their ratings are:
★★★★★ wah
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fuzz face
fuzz face mini
big muff pi