naw dawg.. in simple terms..
Best Bang for the buck FLA, cheap as you can get.. use em, abuse em, throw em away and get new ones several times for the cost of anything else.. 6v GC Batteries carrying the most lead for the least cost.
Worst Bang for the buck AGM/SLA.. literally nothing but garbage until you get into very top of the line, and even then almost none of the gains of AGM are reachable for a small portable overlanding bank.. really only suitable if you gotta install the battery on its side, but its worth the money to try to avoid needing to do that even if it means rebuilding some stuff.. Requires just as much, if not more TLC as LFP.. The only good cheap AGM's are for is strictly starter batteries, since they are almost always at 100% charge and you can downsize the battery/weight and maintain adequate CCA to start, or keep same size to provide high amps for a rare winching.. but a cheaper FLA will do the job just as well for most situations as cheap AGM's are far from real deep cycle, if shown even a little abuse will give up on life far before a decent FLA would in the same situation.. however with a good life they usually last as long as a FLA would had.
LFP provides great bang, for great bucks.. Provides a ton of gains in weight, efficiency, lifecycle, charge rate, required capacity, low self discharge rate, ability to sit for long periods at partial charge, and more.. makes a great house style battery, quickly field charged by solar or generators and blowing the pants off most anything else that dares carry the name "Deep Cycle".. but prices are still several years away from gaining widespread adoption.. still kinda in the early adopter phase and a ton of FUD persists.. its alot of money to mess up, so yeh gotta be willing to do the research and self educate yourself or it could be a very expensive mistake if you choose the wrong battery for the job and dont understand your needs.
Good Charging Habits are required for all batteries, times cost to replace.. If you pack cheap disposable toss aways then its less required but bad charging habits will lead to premature death of any and all battery chemistries.. the more money you got into batteries, the more money you put into protecting those batteries so it does start hurting the pocketbook exponentially as you scale up.
