The best replacement for aldehydes is ketones.

The best alternatives to aldehydes are rated as following:
★★★★★  ketones
★★  alcohols
  ketones which is more reactive

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

Other search terms related to aldehydes and their ratings are:
★★★★★ amines
★★★★ tollens reagent
tollen's reagent
fehling's solution
You have in mind a companion for aldehydes and it is not yet here? Propose!



Google Trends

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aldehydes
ketones
alcohols