Though Deluxe Superior Carpet Spikes have more vibration-absorbing and vibration-blocking "beef" for loudspeaker and rack isolation/decoupling, sonic perfomance of Threaded Superior Spikes is equivalent. Major differences are physical, with each having functional advantages over the other in certain applications.
Big Fat Dots (or Square Fat Dots) usually do best as an interface between loudspeaker and stand.
Steve
Herbie's Audio Lab