I had an opportunity to throw all of the new Hammer's at their Demo Days here in SoCal, and I personally was more impressed with the Sharp Blade of the two you mentioned, it seemed to be a bit more angular for me off of the dry, and the hit was tremendous.  However, I did like the Power Diesel even more than that.  I ordered a Power Diesel and have found it to be just as powerful on oil as anything else in my bag (Fear Factor and Raging Inferno included).  My recommendation would be the Power Diesel, but I don't think you would be disappointed with any of them, they were all fantastic balls on the shot I threw them on.