I click on a link on an e-mail an it opens Safari, when I want to use Opera. I have to kill all the applications living on the down thingy (multi-tasking), although I do know that they may not be using any memory, but they do feel like slowing things down. And of course, I almost lost all my apps, had problems with my iTunes and lot's of other issues when I moved country.
That's not exactly 'just works'.
Of course, YMMV. And that's why we don't use personal examples to say that something is better than the other.
EDIT: OK, not exactly better, but to say something 'just works' or is 'airtight' and things like that. Android works pretty well too.