The best replacement for transfection is transformation.

The best alternatives to transfection are rated as following:
★★★★★  transformation
★★★★★  transduction
★★  infection
  stable
  transient transfection
  electroporation

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

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



Google Trends

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transfection
transformation
transduction