The Godzilla featured in Godzilla: Planet of the Monsters is the absolute largest Godzilla ever to be conceived. It seems the trend recently between Godzilla movies was to one-up the previous incarnation with each new film, making the King of all Monsters just a bit larger than its previous version. Up until the new anime film, Shin-Gojira held the title for largest Godzilla but now that title belongs to the new 2017 Godzilla.
Renowned artist Noger Chen created the following size comparison chart to showcase just how absurdly large the new 2017 Godzilla is when compared to every previous incarnation. Saying the new Godzilla dwarfs all other versions is really an understatement, check it out:

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