If you're trying to choose the best deep cycle battery for your 4WD's dual battery setup, watch this!
Lithium batteries may have a higher price tag but they've got a much longer lifespan, and a lot of pros:

Twice as many usable amp hours (AH) as AGM batteries
Higher lithium input charge means you can charge your battery faster with a DCDC charger
Higher lithium discharge rate means you can run high amp draw things like 240v inverters, power tools and blenders off your 12v system!
More discharge cycles so your battery lives a much longer life
Good quality lithium batteries have a built in BMS (battery management system)

More on Shauno's choice: https://bit.ly/redarclithiumbatteries

Check out the Redarc GoBlock: https://www.redarc.com.au/portablepower