Meal worms and super worms can be gut loaded with the same gut load, and nutritionally, are very close. The advantage to meal worms is that you can get them in all sizes locally, and in small quantities. The advantage to super worms is they are a softer bodied worm, so impaction risks are minimized if not removed. Supers also climb the screen walls with more "gusto", activating chams to feed better. Both meal worms and super worms will last for weeks in an oatmeal bedding, I would add Cricket Crack or Super worm gut load (at Tiki Tiki Reptiles-sponsor). Meal worms can be kept in the refrigerator, Supers are kept at room temperature.
Phoenix worms are a Calcium pill, not a feeder. By far the best feeder for a calcium source for reptiles, Phoenix worms are a must. Buy the medium size as they last longer than the large, store at 55-60 degrees, and if you received fresh Phoenix worms, they should last about 4 weeks. Once they go black, let them pupate into the soldier flies and feed them off. I think the adults have value as a calcium source, although I have not seen a study on this. I would buy from Phoenixworms.com to get the freshest Phoenix Worms, unless you have a seller who can guarantee they are fresh, and stored at the right temperature.
For some further variety, butters, silks, roaches, and blue bottle flies should keep your herd of chams happy.
Nick Barta