Hi Elderblaze,
The quantum edge coil they use is certainly a high quality pocket coil (see post #16 here). How it compares to other types of innersprings would depend on the specific innerspring you are comparing it to but the innerspring generally isn’t the weakest link in a mattress regardless of which type of innerspring is being used. There is more information about the different types of innersprings in this article and in post #10 here and there is more information about innerspring/latex hybrids in post #13 here.
This is a very similar mattress to the first one you linked except it uses blended Talalay instead of 100% natural Talalay. There is more about the different types and blends of latex in post #6 here.
That would depend on whether you are talking about suitability in terms of PPP or about durability. A good quality innerspring with a latex comfort layer wouldn’t have any weak links in terms of durability for higher weights but only your own testing or personal experience can decide whether any mattress is a good match for you in terms of PPP (see mattress firmness/comfort levels in post #2 here). Comfort is very subjective so the choice between different materials or types of support cores would be a preference and budget choice rather than a better/worse choice (assuming they are both good quality materials). The link in my previous reply had more information about latex/polyfoam hybrids vs all latex mattresses and post #28 here has more information about latex support cores vs an innerspring support core.
For most people they would feel and perform quite differently yes.
There is also more about the most important parts of the “value” of a mattress purchase in post #13 here that can help you make more meaningful comparisons between mattresses.
Phoenix