I'm still quite happy with my Bosch Platinum battery (Group 34) from Pep Boys. Probably the best AGM out there for the price. Well made with plenty of juice (770 CCA) and a 4 year replacement warranty!.
I have a dual set-up, and bought Optima red-tops. They were probably the first batch that was made in Mexico, and they started to fail on me within two years. As of two years ago, they wouldn't hold enough of a charge to EVER start the Jeep, and I had to use my booster-box to start it whenever I was going to move it or drive anywhere, expecting that I'd simply never turn the engine off. I always had jumper cables.
In my Subaru, I have an Interstate battery that is now 11 years old and still works like a champ. I threw in the towel and replaced the red-tops with two Group 34 Interstate batteries from Costco for the CJ.
If I had the cash, I'd grab the X2 Power Premium from Batteries+Bulbs. They have been getting rave reviews up here, but that's like $750 in batteries for me.
Unfortunately the way things are going for Sears they might be the ones that are left out in the woods and crap out. It's a rare thing that I ever go to Sears anymore, and only then maybe to look at tools or exchange a life time warranty item, and the new replacements are not made as well as the 30-60 year olds I have, some that were my dad's .
I've been running single or dual Odyssey batteries in every vehicle I've owned for many years. I've never had a problem with any of them...so that's what I'll keep using. I installed the 34-PC1500 in the Scrambler when I re-bought it a couple of years ago. Expensive but worth it, in my opinion.
Just got back from the Zone with a Duraspark Gold I think it is for my daughters Camry. Had one years ago in my jeep and lasted 9 years. This one is replacement for 3 years then prorated for a total of 5 years
I 2nd the Odyssey, have 1 in my Jeep and its great. (I think may crank the motor at idle rpm ) Replaced a yellow top Optima.
Also a Sears Di-Hard Platinum is excellent (if you can find one-- also made by Odyssey), other die hards are not the same as the Platinum.