Optima quality may have improved, but I don't know a single upfitter willing to take the gamble and risk putting their batteries into fleet operations again. They really burned a lot of bridges when batteries starting coming in from the field balloon shaped! Oddly, Johnson Controls has USA plants as well, but took the cheap route when they bought Optima, and moved them to Mexico.
Odyssey is a USA made battery by a company called EnerSys, they have military contracts with their Hawker line, so production will remain here. They always use 100% virgin lead, and not recycled lead that has been purified. They have a great number of patents that make their batteries superior. Some folks will say that Northstar is a copy of Odyssey, but the patents that Odyssey owns assures that they are not.
Odyssey did have a form-factor change that affects people replacing their stock batteries with the Group 31-M, which now requires the Slee Offroad terminal extensions, as they moved the posts further away from the back edge of the battery which puts too much strain on the cables. The correct size form-factor does not have this issue, but it's capacity is smaller.
I'm personally testing a Full River "FullThrottle" battery right now, and after last weekend I'm not that impressed with it, it got pretty low pretty quick. They're a chinese battery made with recycled lead, and I'm not sure about construction enough to say it's handled trail vibrations very well. A battery that can't handle vibrations will suffer tiny fractures internally affecting their charging and discharging.
Deka makes a great battery ad a decent price, they serve as great house batteries, and you can get a Group 31 with 110 amp hours.
If you're going with a second battery, especially a larger one, with
CTEK and REDARC battery isolators/DC to DC chargers, not only do they properly charge AGM batteries that will increase your battery life, but some have built in solar options. These DC to DC chargers increase the charging voltage to allow the batteries charge at the levels they desire. The other added benefit to a DC to DC charger being that you won't have to upgrade your starting battery to match chemistry (It's generally not desirable to have a "flooded cell" battery mixed with an AGM battery, although people do it, their AGM battery will not charge properly and reduce its lifespan).