Dovecot or Courier

Which is the better of the 2 when the clients will be using Outlook 2010, some using IMAP and some using POP3, Courier or Dovecot?

 

Dovecot is said to be faster with big IMAP accounts, but otherwise it doesn't matter which one you use, I'd say.

 

In my case, i had a lot of problemas with dovecot and with courier all just worked fine!