Courier migration to dovecot

Hi, I'm almost ready to migrate Courier to Dovecot 2.2.31 but I have one question about home and mail directory.

It's good idea to have same directory form home and mail ?

Which scenerio will be better and why ?

For example:

A) Home: /home/doamin/user1 Mail: /home/doamin/user1

B) Home: /home/doamin/user1/home Mail: /home/doamin/user1

C) Home: /home/doamin/user1/ Mail: /home/doamin/user1/mail

Thanks & regards, Jack