Hi @Nicola, yes SimpleImputer should be used over Imputer as per the modern implementation. Imputer is now deprecated and no longer in use. It's better to use SimpleImputer instead.

I won't be able to comment on the accuracy though. Since modern implementations tend to be more efficient, it is safe to assume SimpleImputer to work a bit faster than Imputer.

Refer official documentation and code here.

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