Originally Posted by
Kurzior
As to the first, engineering's value is all about how it's used. Obviously you can macro the glove tinker with PoF, but it also comes with some very useful raid tools (rocket boosts ftw). Blacksmithing is a good profession, but its only benefit in a raid is the passive stat buff, but no real utility. I'd stick with Engi, personally.
For the second question, if you actually have both sulfuras and the cleavers, it depends which spec you prefer to play. That said, if you want to play a 2H spec, unholy will outperform 2H frost if you play it well. Since you've presumably been playing DW for a while, you'll probably see a dps drop until you get used to a new spec, so it may not be worth picking up for a pretty small dps advantage later on. Bottom line though, sim it and see what it does.