Hi JMD5.
Welcome to our Mattress Forum! 
I can certainly understand the sense of overwhelm with thousands of options and conflicting information. You are not alone and you came to the right place to get some help sorting through this information.
Sorry to hear that your current Dormeo mattress causes you and your husband pains during the night. Dormeo is an all-foam mattress that contains a 5" soy-infused EcoCell polyfoam support layer with the 1" memory foam layer and a layer or two of 2" “Octasprings -EcoSprings” of unknown density. Even though it’s after the fact you may want to have a look at this red flag deals post here to understand what can go wrong with a mattress purchase that is missing factual data. Regardless of the marketing tactics used to promote a mattress, if verifiable specifics are not available, and the company that sells it is not willing to provide this information., I would assume that the mattress has lower-quality materials that will break down prematurely. An uninformed and trusting consumer can easily fall prey and end up with a mattress that has durability issues showing up much before the end of the warranty. Regardless of the mattress online “reviews” (galore)…outside of PPP (which is the most important part of “value”), the next most important part of the value of a mattress purchase is durability which is all about how long you will sleep well on a mattress. This is the part of your research that you can’t see or “feel” and assessing the durability and useful life of a mattress depends on knowing the specifics of its construction and the type and quality of the materials inside it regardless of the name of the manufacturer on the label or how a mattress feels in a showroom or when it is relatively new
To make a more informed mattress purchase I’d first determine which type of mattress you and your husband like (hybrid, All latex, Foam combos etc.) I’d make some trips to a local store that is willing to provide mattress-specific information and I’d try different styles and mattress types. Then I’d eliminate all the contenders for which you cannot find the mattress specifications you need to know so you can compare the quality of the materials and components to the mattress durability guidelines here Doing this is a sure way to narrow down your options, help you zoom in on a quality product, and reduce the overwhelming amount of information you come across.
Not necessarily! … “Spring” mattresses can be very durable and appropriate for higher weight range sleepers, provided that you like their feel. When selecting a product make sure to look at the mattress durability specifications recommended for someone with a 30+ BMI. A high BMI presents special challenges and generally requires firmer materials (in the support layers especially). This could be firmer latex or innersprings (the type of support component would be a personal preference and in the right design either could be suitable) or even a zoned construction. The same overall guidelines apply with higher weights though that PPP (Posture and alignment, Pressure relief, and Personal preferences) along with using high-quality durable materials that will maintain their feel and performance for longer periods of time are the way to make the best choices. Heavier people in general will need firmer and thicker comfort layers and firmer support layers than those who are lighter and because no materials will last as long with much higher weights the quality and durability of the materials and components is even more important than normal. I wouldn’t “rule out” any type of mattress and base your choices on your own personal testing. Post #3 here has more information and suggestions about heavier weights that is worth reading.
If you like latex, then an all-latex mattress or latex comfort layers over either an innerspring or polyfoam can make good sense. Latex is the most durable material from all types of foams and the upper layers of a mattress are the most important part of durability because they are the most subject to repeated compression and mechanical stress and for most people (but not all) … they contribute more to the overall “feel” of the mattress as well.
I don’t keep track of all the local stores in specific areas of Canada as the industry landscape is rapidly changing, but if you are considering an online purchase you can find a few Canadian manufacturers or retailers in the Trusted Members ~ directory that I think highly of and would be happy to assist and educate consumers.
CBH Wood
Memory Foam Comfort
I hope the above info and links help simplify your mattress search and set you on the right track
Phoenix