Actually, superworms contain far less chitin than mealworms and are therefore more "bioavailable" than mealworms unless you only feed freshly molted worms. They are lower in fat and much higher in calcium. Plus they have such low phosphorus that it's almost impossible to measure. Here is a nutrition comparison.
I personally don't like mealworms for herps because of the rotten calcium
hosphorus ratio and the high chitin levels. Superworms are a better choice nutritionally and also a lower impaction risk.