I have both the BB and Dynamo. They are both very aggressive balls, but in different ways. In my experience, the BB gets into an earlier roll. That translates to more mid-lane, and less backend. This is the behavior I expected ahead of time due to the characteristics of the Bomb core, and for me it's proven to be true.
The Dynamo on the other hand gets through the heads cleaner, and has superior backend for a ball in it's class.
I really like both balls and they fill different needs. But I have to say that the Dynamo is probably the most fun ball I've ever thrown. The ball is versatile in cover alterations and different drill patterns, and should be as much ball as you ever need for oilier conditions.