I have never used either of these two. I was planning to use paper at one time, and it was seized for being "suspicious", lol. But they couldnt open it cause it was under 30grams. So far I have used hubei, orbit, and homebrew powder var. All worked great. I actually seemed to do best with the Orbit var (could have been overdosed though, as there were batchs floating around overdosed).
Based on reputations, if I had to choose between them, I would go with the BD var. Paper prods are very inconsistantly dosed from 1 square to another. Both are very expensive as well. I would rather buy powder var and brew it into solution. just my opinion. But out of those two. I would choose BD to use first.
Mavy