The best replacement for speaker cable is speaker wire.

The best alternatives to speaker cable are rated as following:
★★★★★  speaker wire
★★★★★  instrument cable
★★★★  trs
★★★  guitar cable
★★★  patch cable
★★★  instrument
★★  electrical cable
★  18 gauge speaker cable
★  trs cable
★  audio cable
  mic cable
  super mm2 speaker cable

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Speaking about speaker cable, one probably shouldn't forget about banana plugs.

Other search terms related to speaker cable and their ratings are:
★★★★★ banana plugs
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instrument cable