The best replacement for daikon is parsnip.

The best alternatives to daikon are rated as following:
★★★★★  parsnip
★★★★  radish
★★★★  ngui
★★★  turnip
★★  korean radish
★★  jicama
★  horseradish
★  lobok

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

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



Google Trends

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daikon
parsnip
radish