The best replacement for nikon flash is canon flash.

The best alternatives to nikon flash are rated as following:
★★★★★  canon flash
★★  yongnuo
★  sigma
★  sigma flash
★  nissin
  metz flash

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Speaking about nikon flash, one probably shouldn't forget about canon body.

Other search terms related to nikon flash and their ratings are:
★★★★★ canon body
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nikon flash
canon flash
yongnuo