In my experience, the choice between coupling/spike and decoupling/isolation will depend on the type of floor the speakers are sitting on. If the floor is inherently isolated such as concrete slab, tile on concrete, etc., the spikes work well. Similarly, spikes seem to work well on carpeted floors as well. On suspending wood floors, decoupling is a much better choice minimizing the potential vibrations/resonances from the floor coupling with the speakers muddying up the response, particularly at the lower frequencies.
What your choice speakers with spikes or speakers with a vibration isolation device?
I am in the camp of vibration isolation. I think it makes sense that the less energy transfer into the floor goes into the air. I found these really cool magnetic isolation feet that I’ve never seen before. They are very affordable, the guys are from England. Here’s a link, The company is called solid air audio.https://solidairaudio.com