To Couple or Decouple Bookshelf Speakers to Stands?

I use Blu-Tack between the speakers and the stands with spikes on bottom of the stands. Have hardwood floors over slab, so I use spike shoes to protect the wood. 

" If the question is to either couple of decouple, how did you receive 3 different answers??!"

Don't see 3 different answers. Mine was decouple, reached by trying all options and choosing what I thought was best. Opinion based on experience and experimentation. 

One answer was to couple with Blue-tack - the second was to use Sorbothane to isolate the speakers and the third (and the most confusing) was to use a combination of the two. As I said, this is one of those questions everyone seems to have a strong opinion on. The stands are filled with sand, they have spikes with rubber shoes to protect the floor. I'm going the Blue-Tack route to begin - it makes the most sense to me.  I'll post results. 

Blu-Tak is the cheapest, but not the best. Please do not use Sorbothane, it sucks the life out of everything audio, only  to be used as shoe insoles. Herbies is not cheap, but are the best IMO.

You get a lot of answers because there is no such thing as decoupling. There is only vibration control. This being the case every bookshelf/speaker combination vibrates differently and so there is no one universal answer. If decoupling was a thing then it would always work. So you can be sure its not a thing.

Coupling usually works, because mass is one of the easiest ways of controlling vibration. This is also why sand boxes and massive stands tend to work so well. You could even sandwich a speaker between two books, a thin one under and a thick heavy one on top. Not saying this will be great, but it is something cheap and easy you can try just to see what I mean. Ultimately it all comes down to trying a few things and going with whatever works best in your situation.