If you're going to pick a warrior instead of Dessa, then Tiraksor is the only choice. Kreg Hex is a noobish pick for Hell+U.
Come on, that's enough! In the late game, Kreg saved me from defeat when a powerful Yaris with one and a half stacks of skeletons attacked me with AoTD and KS.
There, 130 demons handled the situation, taking into account all these debuffs!
Why are you being so categorical? I understand that Gurin and Tiraksor are more profitable at the start because they can save troops and defeat more difficult guardians, but I don't understand why you think Kreg is unnecessary on Hell+U.
