Hi jsteele212,
That’s a somewhat difficult choice because there are some risks involved with all of your options.
Just to clarify first of all … the knotted offset coil that is used in the Orthopedic line is 6" tall and then there is a cotton layer over the insulator and springs and then the rest is polyfoam (1.5 lb and some layers are higher density in some of their mattresses) so there would be more than 2" of foam on each side of your mattress (yours would probably have about 3" of polyfoam on each side).
The Eurotop would probably have somewhere in the range of 4" of polyfoam on each side.
I don’t know the density of all the foam layers in each of their mattresses so if you can find that out for the mattresses you are considering and post it on the forum it would be helpful to assess the “risk” involved with each choice.
As you know … choosing a topper that is a good match for both you and the mattress you are using it on has some uncertainty and risk involved to find the right type, thickness, and firmness for a topper that will work best for you. If you can’t test the combination in person it can be almost as difficult as choosing a mattress in the first place.
Post #2 here and the topper guidelines it links to can help you use your sleeping experience as a reference point to choose a topper that has a reasonable chance of success although only your own sleeping experience can assess for certain whether any mattress/topper combination will be a good match for you in terms of PPP.
Based on your feedback though … it sounds like your 3" topper is just a little bit too thick/soft in combination with your mattress and if you can exchange it I would be tempted to try a slightly thinner topper in the same ILD which would be less risky in terms of alignment. I would decide on whether to choose 19 ILD or 24 ILD based on your weight (higher weights would probably do better with a little bit firmer) and on how you felt sleeping on 19 ILD latex (whether you believe you would be OK with a little bit firmer latex). If you think that you would be OK with one step firmer then this may be a little less risky as well but you will need to decide on this based on “best judgement” and on how you felt about sleeping on the 19 ILD topper.
The most effective way to choose which mattress would be the best exchange would be your own careful and objective testing … preferably using the testing guidelines in the tutorial post (see mattress firmness/comfort levels in post #2 here). I don’t know the specifics of the foam densities or layering in their mattresses but with a 2 sided mattress (that you actually flip on a regular basis) and with 1.5 lb or higher polyfoam I would normally expect this to last longer than 5-6 years. I would be tempted to consider the Orthopedic Premier Super Pillow Top rather than the Eurotop both because it would have less polyfoam and because a pillowtop construction may be a bit softer but again this would depend on the specifics of the materials inside the mattress and on your own careful testing. Whether this option would be a good choice for you would also depend on your confidence that your testing will come close to predicting your own sleeping experience because if you do the exchange then you would be out of any further options … especially if the mattress you exchange for turns out to be too soft.
This would be the most risky of all your choices IMO because you don’t have any reference points for which topper would work well on one of their firmer mattress (and it would depend on which mattress you chose as well) so in some ways you would be starting all over again. This would probably be my least favorite option in your circumstances. The only way I would consider this would be to take your topper into the store and test each mattress with the topper you already have to see which combination was the best match for you and again this would also depend on how confident you were that your testing will come close to predicting your actual sleeping experience.
While the information you provided is fairly limited and there are risks involved with all of your options … based on your feedback with your 3" topper I would be tempted to choose a slightly thinner topper on the mattress you already have.
Phoenix