How about walled garden vs. forest? A garden is nice but you can only go so far before you come to a wall. A forest is nice, no walls but you are more likely to get eaten.
The term "walled garden" as applies to Apple products is hardly original with me: http://en.wikipedia.org/wiki/Walled_garden_%28technology%29.
For Android I probably should have said "playground sandbox" instead of "litterbox". I didn't mean "crappy", so much as "everybody gets to play around and do what they please, no rules".
"Forest" might work for Android, insofar as a forest grows without rules (gardens have rules) and there are few if any cleared paths (gardens have paths) and you tend to to run into brambles and bogs (which are generally not found in gardens).