Imagine that little green aliens have kidnapped you and taken you to their home planet.

Would you prefer to be put in their zoo or their circus?

Assume rather "humane" conditions in both situations - ie decent food, no whipping, etc. Obviously in a circus you'll be expected to perform some tricks and in zoo you'll remain in your cage.

So, which one and why?

Please no questions of the kind "would I be allowed books in the zoo or in the circus" -- assume that all such things will be identical in both situations, everything that doesn't reasonably contradict the nature and purpose of a zoo and of a circus.