I feed pretty much all feeders in his cup (dubia, crickets, reptiworms and supers) but for housing or breeding I keep them all in their own container. I have seen crickets grab up a reptiworm and eat one of those but I think a super would beat a cricket in a fight. Supers don't last long in the cup as my cham loves them and only gets them twice a week or so.
Super worms will totally try to eat crickets, but you can put a cube or two of total bites in the cup and not only will your feeders not eat each other, they'll gutload, too!