The best replacement for zerg is terran.

The best alternatives to zerg are rated as following:
★★★★★  terran
★★★★★  protoss
★★★  zerg
★★  protoss strategy
★  terran strategy
★  flood
★  protoss sc2
★  terran hots
★  terran sc2
★  tyranids
★  protoss hots
★  mech
★  terran build
★  tyranid
★  terran mech
★  void rays
★  terran build order
  protoss starcraft 2
  protoss strategies
  zerg strategy
  thors
  toss
  void ray
  colossus
  archon
  stalkers
  mmm
  terran strategies
  toss strategy
  zerg starcraft 2
  borg
  covenant
  4 gate
  protoss strat
  terran strategy starcraft 2
  gas the room
  terran guide

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

Other search terms related to zerg and their ratings are:
★★★★★ terran
★★★ protoss
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