They're the same. The Diehard Platinum line is made by Enersys. The difference is the color of the case and warranty. The Platinum is 4 years replacement and then pro-rated. I just traded up from an Advanced Gold I killed. The warranty covered the cost of the Gold and I paid the difference. The group 34 is $218 at Sears and the lowest online price I could find for the Odyssey is about $240 and you would have to wait for delivery.