Hi drog,
Both spring units would do a find job providing adequate support. Note that the thinner springs in the Combi-Zone are also smaller in diameter and more numerous, so that impacts support as well. An innerspring isn’t normally the weak link in a mattress and the gauge of steel is only one of many factors that determines how a particular innerspring will feel and perform inside a specific mattress design. There is more about the different types of innersprings in this article and in post #10 here but I would pay much more attention to the quality of the materials above the innerspring which is normally the weakest link in a mattress. Post #16 also talks about different innerspring designs and how they work. Hopefully all of this will give you a little more insight to the pocketed spring unit, and also an appreciation of how complicated it is for these engineers to come up with these designs. B)
Phoenix