Hi lizsky,
It would depend on what they used as a fire barrier. In the case of SleepEz they use an inherent viscose/silica fire barrier which has no chemicals (see this article and more in post #2 here and post #2 here).
Both Dunlop and Talalay come in a wide range of firmness levels. If both of them are the same ILD (softness level) then Dunlop will feel a little firmer for most people because it has a higher compression modulus which means that it becomes firmer faster than Talalay as you sink into the layer more deeply. At 25% compression they would be the same. If a layer is compressed less than 25% then Dunlop would be softer. If a layer is compressed more than 25% then Talalay would be softer. They also have a different “feel” and respond a little differently (see post #7 here). I would treat the choice between them as a preference issue and not a better/worse issue. You can also read more about the different types of latex in post #6 here.
Latex would be more durable than innersprings in theory but the support layers of a mattress are not usually the weak link of a mattress (a mattress tends to soften and break down from the top down) so in practical terms a latex core and an innerspring core would both be durable choices and the materials above the support core would be a more important factor in the durability of the mattress. You can read more about the factors that affect the durability and useful life of a mattress in post #4 here.
I don’t keep a specific record of prices and price is only part of the value of a mattress purchase and each person’s personal value equation but I would say you are looking at most of the better value options yes.
Phoenix