[PC BUILD] I would like to know what is is the best thermal paste/compound from these choices?

Of the two that have stated thermal conductivity, TG-11 thermal grease has the highest conductivity. That would be the best of the choices here, except I wonder if 'thermal grease' is the same as 'thermal paste'.

You know any of them would probably work just fine. There isn't much difference in price, so you could go for the cheapest, knowing it would work fine, or the most expensive, just in case it might be better.

I volunteer at a place that rebuilds old computers. We use whatever's cheapest. We put every computer through a thermal 'stability' test, having it calculate several million digits of pi, which makes it work at full speed for maybe half an hour, while we watch the temperature of the processors. We never have problems with the cheapest thermal paste.

Did you know you're supposed to change your thermal paste every year?

The cheaper one...

There is no real magic difference between different thermal pastes, they will all work pretty much the same. All the manufacturers will claim their formulation is magically better, but in reality the difference is so small it doesn't matter.