When it comes to Dubbing, I've bought some and made some. They will all work, but I like piddling around to see what I can come up with. Using a coffee grinder, but I'm thinking of buying a blending board, just because. You can never get too many toys in this craft.
After playing around with different brands of yarn, I find I like Red Heart the best. It just seems to be softer and not get "pills" when I blend it.
I'm on a dubbing kick at the moment. I've got about 8 different base colors I'm playing with.