Any of the "old timers" here will know my answer.
I'm an absolute zealot about natural cages. My philosophy is if you are going to take the animal out of it's home, then make its cage as home-like as possible. It's totally unfair to your critter to keep it in a bleak, sterile, plastic (figuratively, not literally) environment just because it's more convenient for you. Not trying to condemn here .. just my opinion.