Starting point IMO as you know is the Duracell/Deka FLA GCs at 200+AH per $200 pair.
There are only, what six makers of quality true deep cycling batts in the NA market, for FLA:
Rolls/Surette, Trojan, Deka/East Penn, U.S. Battery, Crown, and Superior
Even getting tech support to try to get that cycle chart is doubtful with the rest of the mass-market brands, and even from the above top makers can't really be used to compare to other companies, just across product lines within one company.
Lab charts have nothing to do with IRL, and the level of marketing "optimism" varies enormously.
Best to buy locally, any direct shipping costs even if subsidized by the seller is eating into the value of such a cheap & heavy product.
Anyone knows who actually makes the Apex batts?