I bought a Northstar badged as an X2. They are not Odyssey. Batteries Plus will tell you they are Northstars and they come from the Northstar factory. Look at the casing, too, and you can tell.
Two things if you go Northstar/X2. First, the X2, at least when I bought it, had a better warranty from Batteries Plus than Northstar gives, for the same battery. Secondly, even if you have a local Batteries Plus store, order it online. You'll get a coupon for 10% off right when you open the window. That'll take almost 30 bucks off the top. I ordered mine online and then drove right over to the store where they installed it. They also used a device through the cigarette lighter that kept all the presets on the radio. That's with a 2008 JK, though. I'm not sure how the JL would work. Maybe just replacing the big battery, the little one would keep your presets and settings. I don't know.
Anyway, they are outstanding. I've had one for about 8 months in my JK and I'd never go back. It isn't a deep cycle, though. Also, watch out for AGM batteries at Autozone/Advance/Etc. They are usually not pure lead AGM, which is better. They are good, and cost less, but don't perform as well as a pure lead AGM. These pure lead AGMs can last 10 years or more.
One other thing. You'll hear people complain about Optimas going bad. Usually, they don't. They discharge to a lower voltage than a standard charger can recover. Most batteries sent back to Optima are recharged on a capable charger, and recover perfectly. I'd bet the same thing happens with other brands. Whatever brand of pure lead AGM you might buy, I'd suggest investing in a capable charger, such as one from Optima.
When my JL battery craps out, I'll be going with an X2, for sure.