Which is faster: char(14) or varchar(14)

I think I already know the answer (char(14)), but I would like to
confirm: which is faster?

In Brazil, company id has 14 digits (12 identifiers, 2 control digits).
By today, application use varchar(14) for these, but I intend to
optimize insert/update/delete and search, and I'm considering to change
it to char(14).

Will it give ANY gain? I do use equality and like operators for search.


Regards,

Edson