It's fair to say the iPhone's OS is the snappiest of all three mobile operating systems here. The Palm Pre's webOS comes in a respectable second, with Android bringing up the rear.
There's a caveat here, however, and it's well worth considering. Android runs significantly better on the Hero than on the HTC Magic (in the UK, the Vodafone Magic has less memory). With new handsets comes the availability of faster processors and thus, slicker operation. Android phones, and to a lesser extent Palm handsets, will appear with much greater frequency than new iPhones.
What both Android and webOS have over the iPhone is that they're both multi-tasking platforms by default. In any environment, multi-tasking is the key to a more pleasant experience. For example, we want to use a Twitter app while having a Web-browsing session open in the background. You just can't do this on the iPhone. Apple made this choice to keep the phone responsive -- and it works.
The question is, what do you value more, flexibility or maximum smoothness? For us, the Palm Pre does a reasonable job of finding a middle ground, offering slick UI components but still managing to multi-task.
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