The best replacement for mux is demux.

The best alternatives to mux are rated as following:
★★★★★  demux
★★  llc snap
★★  bus simulink
★  multiplexer
  mux

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Speaking about mux, one probably shouldn't forget about nand.

Other search terms related to mux and their ratings are:
★★★★★ nand
★★ logic gates
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mux
demux
llc snap