jman629,
I think it’s a good idea to test some mattresses locally to get a good sense of the feel of latex and the difference between latex and memory foam (assuming that’s what you are looking at with Select foam). they are very much an apples to oranges comparison (see post #2 here)
It’s difficult to compare the feel of different support materials partly because it can be very subjective, partly because they are very different in how they respond, and partly because it would also depend on the comfort layers that were over either the innerspring or the foam support system which is the biggest part of what most people “feel” on a mattress. It would also depend on the specific designs of the mattresses you are comparing. There are many different types of innerspring mattresses and different types of foam or other materials that can be used in the comfort layers over the innerspring (including memory foam, latex, polyfoam, fibers, and other comfort materials) which would all feel quite different from each other.
Overall though innersprings are “springy” and because latex is the most resilient and “springy” of the foam materials I would have to say that if you are only comparing the support system of a mattress (and ignoring the comfort layers that are the most obvious part of how a mattress “feels”) that a latex support core would be closer to the “feel” of an innerspring than polyfoam.
Phoenix