Mar 15, 2022
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.