Don’t have silk, I have Weight 1,3 Speedy, Black, Dignitas, DNM, Lubicle 1. I plan on doing a core lube also. I may use Black on core and Dignitas on peices.
They're all so different, but my favorite is DNM because it is the most useful. I think that it's more useful because it lasts decently long, and speeds up big cubes a lot.