You're going to have to define "compliment".
Comparing the DDT and the SonIQ is like comparing apples and oranges. What characteristics are you looking for to compliment the Fused? Something stronger? Something weaker? Something rolly? Something with back end pop?
On fresh THS on league night, I was thinking about starting out with the Fused. Then as the transition changes, a ball to use, perhaps a bit weaker but retain a decent backend.
Or vise versa, start out with a ball to use on the fresh THS, then move to the Hyper Cell Fused when the lanes transition.