I have also seen lots of good feedback on the Sears Platinum option since they are made by Odyssey.
Actually they're made by the same company, Enersys. Odyssey doesn't make batteries (they're a brand name). There's only a handful of companies out there that do manufacture them (Enersys, Johnson Control, etc.) There's one or two other big players who I can't remember at the moment. A lot depends on location and shipping more than anything else. Its all about $$$ as usual.
Most of the common ones are by Johnson Control (Exide, Interstate, Delphi, AC Delco, Motorcraft, Duralast, Diehard Gold/Weatherhandler, etc.) Enersys makes the higher-end units from similar brands (Odyssey, Diehard Platinum, Diehard SUV, Exide Ironclad, etc.)
Anyone who really wants to know can use this resource:
http://jgdarden.com/batteryfaq/batbrand.htm