I have not done a side by side comparison - my choice was based on theory and hearsay (search the TMU forum for “drum” as in drum effect). It made sense to me that a more elastic / stretchy the material would not dilute the cushiness of the soft Talalay top layer. I can say from experience that even a fitted sheet can change the feel of a latex mattress, depending on the elasticity of the material it’s made from.
There are certainly reported benefits to using wool in a mattress’s construction, though, and I can see why many people opt to use it. DIY Natural Bedding has lots of useful info on wool here.
To gather more thoughts on this topic, there’s a related helpful forum post here.