Hi ckole,
I switched your post to a new topic of its own with a more descriptive title so your question won’t get buried in another topic that is only about the BestMattressEver.
I’m not familiar with the specifics of the Wall Street mattress but I’m guessing it is one of the mattresses that are sold at R&S mattress.
The support core of a mattress isn’t generally the weakest link of the mattress in terms of durability so the choice between an innerspring (or pocket coil) vs a polyfoam support core (assuming that the polyfoam is a good quality/density material that meets the quality/durability guidelines here which it does in the case of the BestMattressEver) would also be a preference and/or a budget choice rather than a “better/worse” choice.
Polyfoam is less resilient and responsive and somewhat “stiffer” and less “springy” or “bouncy” than an innerspring but it can also make a very good support system for those that are also a little more restricted in terms of their budget or for those that prefer how it feels over other types of support materials or components. Most of the “feel” of a mattress when you first lie on it comes from the upper layers but the type and firmness level of deeper support layers will also contribute to how a mattress feels as well especially when you move or “bounce” on the mattress and the mattress is compressed more deeply. They can also have a more significant effect on how well you sleep over the course of the night and how you feel when you wake up in the morning. There is more about the different types of innersprings (which includes pocket coils) in this article and in post #10 here.
While other people’s comments about the knowledge, service, and guidance of a particular business can certainly be helpful … I would generally avoid using other people’s experiences or reviews on a mattress (either positive or negative) or review sites in general as a reliable source of information or guidance about how you will feel on the same mattress, how suitable or how durable a mattress may be for you, or how two different mattresses may compare and in many if not most cases they can be more misleading than helpful because a mattress that would be a perfect choice for one person or even a larger group of people may be completely unsuitable for someone else to sleep on (see post #13 here).
There are also no “standard” definitions or consensus of opinions for firmness ratings and different manufacturers can rate their mattresses very differently than others so a mattress that one manufacturer rates as being a specific firmness could be rated very differently by another manufacturer. Different people can also have very different perceptions of firmness and softness compared to others as well and a mattress that feels firm for one person can feel like “medium” for someone else or even “soft” for someone else (or vice versa) depending on their body type, sleeping style, physiology, their frame of reference based on what they are used to, and their individual sensitivity and perceptions. There are also different types of firmness and softness that different people may be sensitive to that can affect how they “rate” a mattress as well (see post #15 here) so different people can also have very different opinions on how two mattresses compare in terms of firmness as well and some people may rate one mattress as being firmer than another and someone else may rate them the other way around. This is all relative and very subjective and is as much an art as a science.
There is more about the different ways to choose a suitable mattress (either locally or online) that is the best “match” for you in terms of comfort and PPP in post #2 here that can help you assess and minimize the risks of making a choice that doesn’t turn out as well as you hoped for once you actually sleep on your mattress but when you can’t test a mattress in person (or if you can and you are still uncertain) then the most reliable source of guidance is always a more detailed conversation with a knowledgeable and experienced retailer or manufacturer that has your best interests at heart who can help “talk you through” the specifics of their mattresses and the options they have available that may be the best “match” for you based on the information you provide them, any local testing you have done or mattresses you have slept well on and liked that they are familiar with, any special considerations you may have, and the “averages” of other customers that are similar to you. They will know more about helping you to “match” their specific mattress designs or firmness options to different body types, sleeping positions, and preferences or even to other mattresses that they are familiar with than anyone else so that in combination with your own personal testing you can make the “best possible” choice with the highest chance of success.
Phoenix