There are situations where AGM is worth spending twice as much compared to flooded lead-acid.

• the ‘dweller installs the battery bank in a location where it is not reachable for normal maintenance
• the ‘dweller needs to mount the battery on its side for some esoteric reason (or is 4×4 trekking so the RV itself can end up in weird angles)
• the ‘dweller chooses to run heavier-than-normal loads for the bank size (microwaves, electric coffeemakers, electric cooktops, etc). Note this means the battery can be drained faster (and bulk recharged faster), not that it provides more capacity.
• the ‘dweller has has an actual (not imagined) chemical hypersensitivity
• the advanced ‘dweller is running a single battery for both house and starter systems (“shallow cycling”) <– not for beginners!