The best replacement for sp120 is nf-f12.

The best alternatives to sp120 are rated as following:
★★★★★  nf-f12
★★★★★  sp120l
★★★★  cougar vortex
★★★★  sp120 pwm
★★★★  nf-p12
★★★  gentle typhoon
★★★  af140
★★★  ap 15
★★★  stock h100i fans
★★  jetflo
★  af120
★  noctua nf-f12
  ap120

Your alternative for sp120 is not listed? Suggest!
Speaking about sp120, one probably shouldn't forget about h100i.

Other search terms related to sp120 and their ratings are:
★★★★★ h100i
★★★ h100
You have in mind a companion for sp120 and it is not yet here? Propose!



Google Trends

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sp120
nf-f12
sp120l