The best replacement for gentle leader is halti.

The best alternatives to gentle leader are rated as following:
★★★★★  halti
★★★★  harness
★★★  easy walk harness
★★  pinch collar
★★  choke chain
★★  prong collar
★  illusion collar
★  easy walk
★  halti head collar
★  canny collar
★  halti collar
  choke collar
  holt
  no pull harness
  muzzle
  halti harness
  sensation harness
  snoot loop
  martingale
  head collar
  haltie
  prong

Your alternative for gentle leader is not listed? Suggest!
Speaking about gentle leader, one probably shouldn't forget about muzzle.

Other search terms related to gentle leader and their ratings are:
★★★★★ muzzle
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gentle leader
halti
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