I can't give you a clear example, and admitedly the BB browser does a GREAT job with page rendering, But here's a few other things to keep in mind:
-Mini runs its pages through Opera's servers meaning, you are getting a trimmed/compressed version of the page. This should save time and data.
- Mini was designed to put the web on as many phones as possible, not just smart phones. Opera Mobile
is the product that is targeted at smartphone users, but it's not available for RIM phones.
So Mini is the broad based, designed to run on any phone that has a data connection and can run Java. I think that we are having this discussion comparing the two products is a great testament to the folks at Opera.