The best replacement for gojira is mosura.

The best alternatives to gojira are rated as following:
★★★★★  mosura
★★★★★  godzilla king of the monsters
★★★★  mastodon
★★★★  liviu vasilica
★★★  meshuggah
★★  supesu gojira
★  ady gil

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Speaking about gojira, one probably shouldn't forget about randy blythe.

Other search terms related to gojira and their ratings are:
★★★★★ randy blythe
★★★ devin townsend
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