Hi Gardner1,
As paisley also mentioned … I would try to test some latex mattresses locally. It’s very different from memory foam (see post #2 here). A latex mattress with a stretch knit cover still won’t feel like memory foam. Post #6 here has more about the choice between a stretch knit cover and a wool quilted cover.
The same would hold true for the choice between Dunlop and Talalay latex which also have a different feel (see post #7 here). They both come in a range of firmness levels from softer to firmer and both are suitable for support layers but they will “feel” different.
The choice between different high quality materials is always a preference choice and only your own experience will be able to tell you which one you prefer.
Phoenix