I don't advise anybody actually do any testing on what the stats do further until 2.0 comes out. We've been told the stats will change and be obvious as to their use. We've got probably a few months left of the game and any comprehensive testing would take a large chunk of that time.

The fact that people at one point were rampantly going about the crafting community saying mag. craft = orb color just goes to show that people say whatever they feel they see (which is often wrong). Our brains are hard-wired to see patterns, it helped our ancestors stay alive, stay well fed and rise to the top of the foodchain. So while one person sees Darksteel nuggets as needing high control (i've seen this suggested multiple times) another says craftsmanship (also seen this). I'd advocate balanced stats as high as you can go until 2.0 as the limited tests I've seen, and done don't show a massive swing in success rate/progress gain either way.

Please keep in mind you need ~1,067 samples to have relevant data, a few hundred is as good as worthless and eyeballing/gut/instinct is equally useless. Let's advocate proper testing rather than "he said, they said, dev said" please.