Hi woofwoofgrrl,
There is more information about wool toppers and how they compare to various foam or latex toppers (at least in general terms) in post #8 here and in posts #3 and #6 here and there are some additional comments about wool toppers and a list of some of the better sources I’m aware of in post #3 here but the choice between wool and latex would be strictly a preference choice and would depend on which material you tend to prefer sleeping on and of course on the thickness and firmness of the toppers you are comparing.
There is also more information about choosing a topper in post #2 here and the topper guidelines it links to that can help you use your sleeping experience as a reference point and guideline to help you choose the type, thickness, and firmness for a topper that has the least possible risk and the best chance for success. It also includes a link to a list of some of the better online sources for toppers I’m aware of as well.
Phoenix