"Just make sure the dubias are no bigger than the space between your dragon's eyes. Good luck!" Some people I think mis-read this. They should be no wider then the space between your dragons eye's. Otherwise no beardie would ever beable to eat a adult dubia.
ANYWAYSS Dubia are better then Crickets in many ways, Less chitin and more meat, hardly smell and only need to be cleaned once every few months (depending on the size). I have a pretty good sized colony and i have only cleaned the tub out maybe 4 times in the last 8 months. Dubia are much more expensive though so unless you are wanting to breed your own colony stick with crickets. Crickets breed much faster but also die faster and can get smelly if not cleaned out often. Dubia take 1 month to give birth (they dont lay a eggsac like other roaches) and it takes them 4-6 months to hit adults, Heat is the major factor in breeding dubia. The hotter it is the faster they will breed and grow. IT all really comes down to what you are wanting to spend and how patient you are. Once you get a good colony of Dubia and you start selling what you dont need they really do pay for themselfs, but are pretty costly to start up. Crickets are cheap and breed much faster.
I have yet to buy any feeder other then the ocasional phoenix worm and supers, and I have never came close to running out of Dubia roaches. I have well over 130 females which is about 1400 dubia babies a month roughly.
Health wise Dubia is the choice due to more meat to shell ratio
Cost wise Crickets win this one.