Originally posted by marist89
If you've never done it, the migration tool is the way to go.

I would exp/imp as a last resort. I would only use it if there is something really messed up with the database (block size, etc) and that's the ONLY way to fix it.
I would use almost alawys exp/imp. That is the best ways to upgrade: create a cleam DB from sratch. But it is the more difficult way too :-)