Work at AZ.. The Platinums are the alternative to the Optimas. They are both made by Johnson Controls, both great batteries. I believe the only difference is the Optimas are mad (at least the internals that I know of) from all new material, not recycled, and the Platinums are made from recycled. They both have the same 3 yr free replacement warranty, you just save about $60.00 with the Platinums. I haven't heard any complaints about the Platinums so far.
There's a member on here, I can't remember the name, but he works for Johnson Controls, and he had a recent post in a topic about Optimas where he talked about the materials.