I think I mentioned gels, but don't recall. Another thought occurs to me that these are getting more and more difficult to source. Maybe they'll make a comeback one day, as I think they are a very effective house bank solution.
Yes GELs lost to AGM within the SLA category.
They can take deep cycling better than any other lead battery
If anything, AGMs seem to get cranky if they don't spend routine time at 100% SOC.
Firefly Oasis is designed to handle both scenarios well, with a periodic trivial protocol to restore lost capacity when PSOC conditions reduce it.
I believe GEL overpromising in that regard may have been part of the reason for their downfall, along with being "too finicky" sensitive to incorrect charging parameters.
Of course regularly going well below 50% does exact a cost in lifetime cycles with any house chemistry, including LFP.
Anyway, if I do expand the house, maybe I should consider AGMs at that time. Simply given the difficulty with sourcing gels. That means new chargers, sensors, smart alternators, etc.
I would advise making sure it's the last time then, make sure all charge sources' profiles are fully adjustable by the user, not just selecting canned presets, but tweaking setpoints, Absorb from 13.75 to 14.15, adjustable hold time, etc.
One way is put non-suitable sources on Starter, and use only a large enough DC-DC Sterling batt2batt charger for House.
But high output alt charging should go direct to House, via Balmar MC-614, or other tweakable external VR.
Also make sure wiring, connections, CP are designed to handle sustained high-amp charging.
That way, if you decide ten years from now to go LFP you don't need to replace infrastructure again.