I think the Dynamo has better length then the Dimension, not much, can handle a higher volume of oil, reacts stronger at the break point, swings easier (recovery is better)and will cover more boards then the Dimension.
The Dimension goes into a roll sooner then the Dynamo, covers a fair amount of boards but is more controllable, not as likely to get you in trouble but rolls out earlier/sooner then the Dynamo, but the Dimension carries better.
Both the Dimension and the Dynamo coverstocks are easy to adjust.
My opinion, I have both, since no one seemed interested or knowledgeable to answer your question, I thought I'd give you my feedback. Had both, still have both though one of my Dynamos cracked and neither one of them are in my league or tournament bag.
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Nicanor (Ten On The Deck)