Lifeline AGM batteries are excellent. I've installed a lot of them in off grid homes and cabins over the years. There's no issues selecting one if you need AGM. Deka are really good too.
Do you need an AGM? If your battery is located inside a living compartment or isn't otherwise vented to the outside then you do. I typically just use a flooded battery like a golf cart or larger size but then I don't mind checking the water and adding if needed. They are cheaper than an AGM. If you don't want to check your batteries or worry about adding water then go with an AGM.