All arguments aside... chances are if you're buying a battery that it was probably produced by Johnson Controls Battery Group... only about 3 companies produce most of the batteries on the market with Johnson Controls being the largest of the 3.
They make the Optima Brand, as well as the toyota brand batteries and hundreds of other "brands" that you may pick up anywhere.
The Panasonic Batteries are made in Japan... by Panasonic as far as I know. However their performance has not been spectacular in my experience but I live in a climate that gets extreme high and low temperatures and that does effect a battery. I personally would not pay extra for something that doesn't perform any better but if you do find a Panasonic (not toyota/truestart) brand battery for around the same price as others I'd consider it. Then again you only got about 3 years out of your OEM battery... so the choice is yours, just know that lots of batteries have a full replacement warranty of at least 2 years, many have a full 3 year with prorated warranties after that.
" The award was given to Johnson Controls to recognize its 100 percent on-time-delivery and order fulfillment for the original equipment automotive batteries it supplies to the automaker. In 1998, Johnson Controls shipped 225,000 batteries to Toyota. While Toyota battery orders have increased each year, Johnson Controls has continued its perfect fulfillment record.
Johnson Controls supplies automotive batteries to Toyota for the original equipment market under the Toyota brand name."
Johnson Controls also makes -
[sears' DieHard, Auto Zone's Duralast, Wal*Mart's EverStart, Motorcraft, Optima, etc. Starting]