I'm no pro .. so take this for what it is .. but I'd go with Hulk .. simply since you already have a maxed out 4* Void ... that'll get you through most stuff in place of the other void ..and OG hulk, from what I've seen .. is a monster for grinding through a lot of other stuff ..no on the other hand, if you're already Cavalier .. then those 4* are mostly useless .. and shouldn't be in the equation ... then in that case .. uh ... I have no idea .. :P hehe(might still go with hulk, just because he's awakened .. *shrug* )