Hi Mermalade.
Welcome to our Mattress Forum.
Thank you for sharing some of your sleep stats with us. It is great that you're looking for a mattress that is going to give you the longevity you're looking for and
your budget
definitely allows for a quality mattress! If you haven't done so already, I would suggest taking a look at our
Mattress Durability Guidelines
for more information on selecting a durable mattress.
Here is one (of many) useful snippets from that resource that pertains directly to you:
In lower BMI ranges then using slightly lower quality/density and less durable materials can be a little less risky because you won't sink into the mattress as much and lower density foam materials won't be subject to the same degree of compression that cause them to soften and break down as quickly as they would for higher weight ranges. While I would generally use the same guidelines as for a BMI that is less than 30, if you are restricted to lower budget ranges where higher quality materials may not be available (say under $400 or so) and if there is a lower quality/density layer that is deeper in the mattress and has an inch or two of higher quality and more durable materials above it then a slightly lower minimum guideline of 3 lb per cubic foot density for memory foam or 1.5 lb per cubic foot density for polyfoam may be worth considering as a reasonable "cost/durability compromise".
Since you mentioned wanting to support a local business, I would also recommend reading this resource on
identifying a quality retailer
.
Now to the two mattresses you mentioned!
I did some research in an attempt to find any detailed spec information about either mattress and unfortunately found nothing. It may be worth asking the outlet/retailer you buy from if they have the foam density used in the various layers of these mattresses and if they will share that with you.
If you happen to come across these specifications and wish to share them here for us to review, you are more than welcome to do so.
NikkiTMU