The best replacement for banelings is thors.

The best alternatives to banelings are rated as following:
★★★★★  thors
★★★★★  marauders
★★★  hellions
★★★  terran
★★  widow mines
★  hellbats
  255 marines
  wild mutation

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

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



Google Trends

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banelings
thors
marauders