Uros usually get about the same size as a bearded dragon, depending on the species. Although malis don't get as big as some other uros, they still require a cage about 40-55 gallons or bigger, just like the beardie. They are pretty much strict herbivores though. Beardies are omnivorous. Uromastyx require a substrate they can burrow in though, and need HOT temperatures. We're talking a basking spot of about 120 degrees F. Both species require UVB lighting of course too. I'd stick with the beardie if you're new to lizards.