All my experience has been with Uros. Never had an opportunity to acquire a chuck as they are not commonly available in my neck of the woods.

From what I understand, their husbandry is pretty darn similar. Either way, you're going to have a moderately-sized fat lizard who likes it hot and dry, and is a herbivore. The main question is: do you want it to have a spiky tail, or a long, smooth one? (lol)

Personally, if you have an opportunity to keep a chuck, go for the chuck. Not many have them readily available, as I could count on one hand the number of people breeding them in captivity. It would be nice to see more people keep them.