I'm assuming that Manwë liked gold because the Vanyar, who were Golden, were "his" people, just like the Noldor were Aulë's "people." Also, gold is considered more precious than silver (it might be different for mithril), so the most powerful of the Three would probably have the most precious metal.
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But Melkor also was there, and he came to the house of Fëanor, and there he slew Finwë King of the Noldor before his doors, and spilled the first blood in the Blessed Realm; for Finwë alone had not fled from the horror of the Dark.
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