Hi Almbriano,
Your question is very similar to another question that was asked a couple of days ago (and is asked quite frequently) and post #387 - 389 here along with the first part of post #2 here and especially post #2 here which talk about “matching” a more objective set of targets instead of the more subjective “feel” of another mattress may all be helpful.
Once you have a set of guidelines about all the more objective factors that are most important to you … then this post (and the links it includes) can give you some steps that will give you much better odds of buying a mattress that not only matches your needs and preferences but has much better quality and value than the two you are looking at.
As you can see … besides some basic research into mattress materials and construction and eliminating the worst quality/value choices the next step is to find the smaller local or independent manufacturers in your area (instead of major brands) that are sold either factory direct or through better sleep shops that have the ability to tell you what is in their mattress (so you can make more meaningful comparisons with other mattresses) and the experience, knowledge, and selection to help you make your best possible choices.
The two mattresses you linked are good examples because they use very different materials which would have a very different “feel” and performance for most people but they share the same poor value and “weak links” of lower quality soft materials in the upper comfort layers which will soften and compress much too quickly and are the biggest reason that both are “low value” mattresses. You will find that there are many mattresses that “feel” and perform the same or better but that use higher quality materials (that a better retailer or manufacturer will actually tell you about) and that will “match” your needs and preferences just as well (or better if you were only testing for the “comfort” of each mattress) but with higher quality materials that will last longer at a better price.
At least it’s clear that you like soft mattresses but I would also make sure that you test for alignment because “comfort” is easy to feel in a showroom but support and alignment is what you will feel with long term use and is more difficult to “test” for in a showroom. Choosing a mattress that is too soft for someone’s body type and sleeping positions in the managed environment of a showroom or choosing a pillowtop with too much soft lower quality foam in it are two of the biggest “mistakes” people make when buying a mattress. Post #11 here will help with testing for alignment/support.
Phoenix