Both cages are a good size. The only thing I don't like about them is the floor. A chinchilla should have a maximum of 1/2" x 1/2" floor spacing or risk of foot fractures goes way up. If you can get one that has a metal cage pan you can remove the floor and just go with cedar chips. Some cages, like the Ferrent Nation, have metal pans available that are deep for chinchillas as a third-party aftermarket option.
tjschinchillasupplies.com has a decent selection.