If the bigger concern is holding enmity Steel Cyclone lets you do more overpowers. Unchained doesn't. I love the combo you suggest, but there's certainly times I'm pulling faster than my tp will allow to use that instead of Steel Cyclone.
Edit: also pre-infuriate most of the times you'll have Steel Cyclone ready are when you're low on tp and resorting to single-target skills anyway, at which time the mobs are too close to dead to bother with unchained.
