Hi Rocker77,
The thickness of a mattress is just a side effect of the design and by itself isn’t particularly meaningful because whether a thicker or thinner mattress would be better or worse for any particular person will depend on the specifics of the materials (type, firmness etc) and on all the other layers in the mattress. Thickness is only one of many specs that are used to make different mattresses that perform and feel differently and that makes a mattress suitable for one person and not another. There is more about the effect of thickness in post #14 here. Regardless of how thick or thin a mattress may be … the most important part of the “value” of a mattress is how suitable it is “as a whole” for your particular body type, sleeping positions, and preferences in terms of PPP (Posture and alignment, Pressure relief, and Personal preferences) regardless of how thick it may be. There is certainly no reason that at your weight you would “need” more thickness than either of the mattresses you are considering but you may still “prefer” a mattress that is thicker or thinner depending on the design.
The support of a mattress doesn’t depend on its thickness but on it’s design. There is more about the different ways to choose a mattress (either locally or online) that is the best “match” for you in terms of PPP (Posture and alignment, Pressure relief, and Personal preferences) that can help you assess and minimize the risks involved in making a choice that isn’t as suitable for you as you hoped for with each of them in post #2 here.
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 quality/value comparisons between mattresses in terms of suitability, durability, and value.
And finally there is also more about primary or “deep” support and secondary or “surface” support and their relationship to firmness and pressure relief and the “roles” of different layers in a mattress in post #2 here and in post #4 here that may also be helpful in clarifying the difference between “support” and “pressure relief” and “feel” although with careful testing on a mattress this may be more than you really need to know.
Both Sleeptek here and Green Sleep here have a store finder that lists the retailers that sell their mattresses but I don’t know which of them sell online.
The mattress shopping tutorial also includes a list of some of the better online options I’m aware of that ship across Canada (in the optional online step) and many of these also sell latex and latex hybrid options although you also have some good options available to you in Alberta including TMASC (I’m not sure where you are but the Edmonton list is here and the Calgary list is here).
Hopefully any of the forum members that own either mattress will also see your post and share their comments but a forum search on Green Sleep Vicence and on Sleeptek Euro (you can just click the links) will bring up all the forum posts and comments that mention them.
Phoenix