I don't think it’s possible to generalize like that, but you can say that they definitely always are among the top ones. When you look at what cameras are used for most photos on sites like Flicker, iPhone is topping them.
The thing is that your phone is always in your pocket. That’s a huge advantage over any other camera. But iPhones are the only phones that win over “real” cameras. Samsung is in spot four, behind Nikon.