She has Grisly Mutilation AND Terrifying Fury.
Now if you want my opinion, the AW is much more useful in a team environment than the SS. Sleep combos, Dispel, PotA and Weakened passives are incredibly useful, while the SS only has Panic as a CC. Reworking the AW as a tank of "equal team usefulness" as the SS would require some hard modifications on his current trees.
I personally survive much more easily on the AW on higher difficulties, but that's because of lower promotions I guess.
I definitely find the SS to be a lot easier to survive with than the AW above perilous, simply because if enemies are resistant to an elemental damage type, you only do one damage and that means no barrier for the AW.
That said, different strokes for different folks. And my stats are starting to get in the ridiculous range, so that is definitely boosting the SS quite a bit.