I have both, and I haven't fed any of the dubias because I actually think they're really cute! But they are breeding well for me.
I haven't yet gotten my Turkistans to breed, but our weather has finally warmed up and I think I found an ootheca (egg case) in their tub. They smell more than the B. Dubias, and they're really hella fast compared, but my Fat Tail loves them!
I think they're both excellent roaches, but like I said, I have had slightly better luck with my dubias breeding and they don't stink as badly.
Help! Crested Geckos! 0.1.Leachie, 2.1.1 Gargs, 1.0 Chahoua, 2.1. Blue Tongue Skinks, 1.1. White Lined Geckos, 1.3. African Fat Tails, 2.2.0 Tokay Geckos, 1.0. Giant Day Gecko, 2 tarantulas