[Dovecot] cyrus2courier or cyrus2maildir.py, which to choose?

What's the best utility to use to convert mail folders from a cyrus 2.2.13-10, on a debian 4.0 Etch system, to folders that can be used by dovecot?

The http://wiki.dovecot.org/Migration/Cyrus page isn't too clear on what's the difference.

cyrus2courier says "It should be able to preserve message UIDs, flags and 26 first keywords."

cyrus2maildir.py says "preserves delivery timestamps and \Seen flags."

But does that means that what cyrus2maildir.py preserves is in addition to what cyrus2courier preserves? Or is what cyrus2maildir preserves a subset of what cyrus2courier preserves?

Thanx!

• Steinar