The best replacement for armagnac is calvados.

The best alternatives to armagnac are rated as following:
★★★★★  calvados
★★★★★  cognac
  bas armagnac
  bas-armagnac

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Speaking about armagnac, one probably shouldn't forget about prunes.

Other search terms related to armagnac and their ratings are:
★★★★★ prunes
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armagnac
calvados
cognac