The best replacement for figure 8 is atc.

The best alternatives to figure 8 are rated as following:
★★★★★  atc
★★★★  green spotted puffer
★★★  bowline
★★  atc rappel
★★  figure 9 knot
★  sling
★  overhand knot
★  double bowline
★  flash noseband
  belay
  belay device

Your alternative for figure 8 is not listed? Suggest!
Speaking about figure 8, one probably shouldn't forget about yosemite finish.

Other search terms related to figure 8 and their ratings are:
★★★★★ yosemite finish
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figure 8
atc
green spotted puffer