Hi ls3gmc
Welcome to our Mattress Forum! 
Congratulations for finishing the house renovation project … nice to be able to change to a king and get some extra room to increase your mattress “real estate”.
You are on the right track with selecting beds with good quality and durable componentry as major brands such as Sealy/Stearns & Foster, Simmons, and Serta tend to use lower quality and less durable materials in their mattresses than most of their smaller competitors that will tend to soften or break down prematurely relative to the price you pay which is why I generally suggest avoiding all of them completely (along with the major retailers that focus on them as well) regardless of how they may feel in a showroom along with any mattress where you aren’t able to find out the type and quality/durability of the materials inside it (see the guidelines here. along with post #3 here. and post #12 here. and post #404 here.).
Two of the most important links in the tutorial that I would especially make sure you’ve read are post #2 here which has 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”, firmness, and PPP (Posture and alignment, Pressure relief, and your own Personal preferences) that can help you assess and minimize the risks of making a choice that doesn’t turn out as well as you hoped for and post #13 here which has more about the most important parts of the “value” of a mattress purchase which can help you make more meaningful quality/value comparisons between mattresses in terms of suitability (how well you will sleep), durability (how long you will sleep well), and the overall value of a mattress compared to your other finalists based on all the parts of your personal value equation that are most important to you (including the price of course and the options you have available after a purchase if your choice doesn’t turn out as well as you hoped for).
I always tend to trust my gut feeling in cases like this but just to rule things out … some theory at a distance might help at least to know what to focus on in terms of characteristics and differences between the two to see if it worth taking a trip to test-try one … but generally speaking, unless there is something that completely disqualifies this mattress type… you are correct that personal experience is the best way to assess if you like how it feels for you. whille both innerspring and a firmer latex core are great as a support layer each has very “different” characteristics and the most important differences are the ones you can feel and that you personally prefer. Both can be softer or firmer depending design … a pocket coil could be firmer than a latex core or the other way around they could also be zoned or not … all depending on the specifics of the components you are comparing. There is more about this in post #10 here and more detailed information about innersprings vs latex support cores in post #2 here and more about the different types and blends of latex in this article and in post #6 here or post #28 here. (At a quick glance I wasn’t able to find something that you could in your general area.)
After youve had a chance to go through the readings mentioned above you may wish to approach the 3 TMU expert members based in Canada and see if they can help you think through and determine the likelihood that you might like all-latex beds better.
Dormio Expert website here
Memory Foam Comfort Expert website here
The Mattress & Sleep Company Expert website here and here
TMASC also carries both innerspring and all-latex and can help with comparisons based on customer feedback All three experts mentioned above carry all-latex beds and ship throughout Canada and I think highly of in terms of transparency, knowledge, and are extremely skilled in helping customers find the right product and match.
Phoenix