Nearly all of the Everstart batteries sold at WalMart are either produced by Clarios (formerly Johnson Controls) or East Penn. Other brands made by Clarios include batteries labeled: Interstate, DieHard, Autozone-Duralast, Advance Auto-Autocraft, Delco, Honda, Nissan, Toyota. East Penn makes batteries labeled Deka, Duracell, NAPA, Oreilly's SuperStart/Proformer and others. You can determine the manufacturer by looking at the part number on an Everstart battery on the bar code label. Clarios batteries will start with "JC", while East Penn batteries will start with "EP".
I prefer the East Penn batteries, but Clarios batteries are a close second. Both are good quality batteries and any need for a replacement under warranty is easy to claim at your local WalMart.