The best replacement for geckos is lizards.

The best alternatives to geckos are rated as following:
★★★★★  lizards
★★  bearded dragons
★  skinks
★  geckos
★  newts
★  anoles
  leopard geckos
  crested geckos
  bearded dragon

Your alternative for geckos is not listed? Suggest!
Speaking about geckos, one probably shouldn't forget about dart frogs.

Other search terms related to geckos and their ratings are:
★★★★★ dart frogs
anoles
You have in mind a companion for geckos and it is not yet here? Propose!



Google Trends

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geckos
lizards
bearded dragons