Honestly Niether. Stick with either crickets, phoenix worms or even silkies are good. meal worms can cause impaction and wax worm's are too high in fat.
Yeah I wouldn't feed meal worms to an adult dragon let alone a juvenile; they just aren't good for them. Once it gets over 12 inches you can try a couple superworms a week as a treat. Roaches, silk worms and crickets are the best to use as a staple.