The best replacement for servos is analog.

The best alternatives to servos are rated as following:
★★★★★  analog
★★★★★  steppers
★★★★★  stepper motors
★★★★  motors
★★  standard servos
★  analog servos
★  aircraft servos
★  expanded storage
★  futaba
★  steppers cnc
  digital servos
  digital
  hitec

Your alternative for servos is not listed? Suggest!
Speaking about servos, one probably shouldn't forget about spektrum receiver.

Other search terms related to servos and their ratings are:
★★★★★ spektrum receiver
★★★ dx6i
★★★ futaba
★ jr receiver
You have in mind a companion for servos and it is not yet here? Propose!



Google Trends

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servos
analog
steppers