If OS X and iOS ran smoothly,
then
a) I wouldn't have confounded the big brick computer store, when going in for warranty work, showing him how tapping the Network icon locked up the iphone (this was a while ago; I've moved to another brand since)
b) you wouldn't have so many complaints about "the beach ball o' death"
For low-end fluff, OS X is as stable as the rest of them... it's not perfect, either, but I've had the beach ball ruin my day just as much as it has for many others. I do put OS X above Windows, solely because there's no bleepin' registry...