would better do是正确的。
拓展：
Would better+动词原形，表示“最好还是...”和 had better+动词原形，一样的意思，但是would better语气上更加委婉。
Would better例句
You would better not believe all what he said.他说的话你可不能全信。
Had better例句
You had better watch out for that guy.
小姑娘，你最好小心那个人。
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