The best replacement for panettone is stollen.

The best alternatives to panettone are rated as following:
★★★★★  stollen
★★★  brioche
★★  pandoro

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Speaking about panettone, one probably shouldn't forget about mascarpone cream.

Other search terms related to panettone and their ratings are:
★★★★★ mascarpone cream
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Google Trends

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panettone
stollen
brioche