Hi Barry,
Since I discovered the major benefits in using Cone/Spike Decoupling Gliders under the spikes of my floor standing Von Schweikert VR4jr speakers, I have experimented with both these or just using Big Fat Dots under the bass cabinet (with the spikes removed) of my speakers. The results is similar; and the only minor difference I can detect is that when using spikes on top of Cone Spike Decoupling Gliders, there is a touch more air/clarity while with just Big Fat Dots, the sound is a touch more mellow & richer but a tad less air and clarity. I hope this helps.