The best replacement for deathadder is naga.

The best alternatives to deathadder are rated as following:
★★★★★  naga
★★★★  g500
★★★★  mamba
★★★★  imperator
★★★  taipan
★★★  sensei
★★  lachesis
★★  abyssus
★★  rival
★★  g400
★★  xai
★  mx518
★  deathadder 2013
★  sensei raw
★  naga hex
★  g700
★  g9x
★  ouroboros
★  m65
★  orochi
  steelseries sensei
  rat 7
  razer imperator
  zowie fk
  logitech mx518
  g5
  g9

Your alternative for deathadder is not listed? Suggest!
Speaking about deathadder, one probably shouldn't forget about goliathus.

Other search terms related to deathadder and their ratings are:
★★★★★ goliathus
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