imo - shadowcraft is stat-wise simply superior
+12 armor
+.56 dodge from agi
+.45 crit from agi
+2 attack power from agi
hit vs haste I look at this way:
1) anything that haste helps with at lvl 1, hit helps with also
2) the opposite isn't necessarily true, if you can't hit it (mobs > lvl26ish) haste is worthless
3) less swings with more hits > more swings with fewer hits...especially if you're using proc weapons
that's not to say that i don't use the dreadmist helm. in level one pvp against a hunter/caster it makes sense since your armor benefit is worthless against magic damage and more swings vs kiters is good
however, stat wise, your chance to hit is greater, you hit harder, crit more, and have extra mitigation with shadowcraft
as stated above, it is just easier to wear what is expected than to answer all the questions! that's the reason i have battleworn thrash blade equipped most of the time even though the blessed hammer of grace does more dmg. i just make sure to macro switch all my gear before i battle.
oh, and dreadmist makes you look dumb too
*edit* armor fixt ... thanks Djaeb ... stupid blizz changing things during my 6 month break