Have had both AGM and Flooded wet (And maintenane free)
When I first got the RV I added AGM's on a seperate 12 volt system (inverter) programmed for AGM, they were the youngest batteries in the RV and the first to DIE.
THey also cost the most
AGM's do have some advantages.. For example due to low venting you can put them in places you'd not put a flooded wet battery
You can mount them without regard to a "This side up" sticker
And LIFELINE (make specific) can be charged a bit faster... .if that is you have a big enough carger.
But the other "Advantage" I have read about.. DO not seem to hold up.
The biggest advantage seems to be the store's profit. higher along with teh price
THUS when 5 years after the NEWEST batteries in the RV got repalced the OEM Interstate Flooded wet cell GC-2 class died.. I went with Deka G-20s another GC-2 class. Why Deka?
Politically: they are made 100% in the USA of lead smelted in the USA (East Penn is the only Lead smelter in the USA)
Practically... I was driving past a DEKA store at the time (Ok that was by design but the store was on an optional route to where I was going).
Those suckers were heavy. I could wrangle the Interstate 2200s by myself but I needed help with the G-20's they are 10% bigger.
Home was where I park it. but alas the.
2005 Damon Intruder 377 Alas declared a total loss
after a semi "nicked" it. Still have the radios
Kenwood TS-2000, ICOM ID-5100, ID-51A+2, ID-880 REF030C most times