I'm not familiar with Blue Dots, but Blu Tack and Herbie's Big Fat Dots are two completely different items. Blu Tack anchors speakers to the stands (Blu Tack), the other decouples speakers from the stands.
It's up to you to decide which you prefer, but it's completely listener dependent. One cannot be claimed universally better than the other.
It's up to you to decide which you prefer, but it's completely listener dependent. One cannot be claimed universally better than the other.

