Deka makes great batteries. In another life I used hundreds of the group 27 and thousands of the group 24 gel batteries. Really consistent.
AGMs can make great (cranking) power, but are finicky with charge profile. You can dry them out. A tender/maintainer designed for a wet battery might do this.
I have had decent luck with walmart batteries for my powerstroke diesel. Get the newest date code in the rack, and pick them up. Often times the $107 battery weighs 8 lb more than the $104. (The group 65 diesel battery price)
That's a lot of lead, and resulting capacity for $3. Totally worth the difference. As is a 6 watt solar panel. The 6 watt Ganz Eco-Flex does a great job on my flooded batteries in the center console. And you can step on the solar panel, too.
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