Menneisyys at Mobility Site did a (very) detailed comparison between every available Windows Mobile browser with the benchmark set as the iPhone’s Safari. Opera 9.5, Skyfire, Opera Mini, Iris, Internet Explorer 6, Pre-6 Internet Explorer and NetFront, all in their latest versions were put to the test.
Since the benchmark was Safari, Menneisyys included in his comparison only finger friendly browsers, and he used the Pre-6 Internet Explorer with SPB Pocket Plus that adds finger scrolling on IE.
The comparison covers stuff like, Real-world rendering tests, Scrolling-related tests, Input, Stability, Full screen and VGA support etc.
As for a definitive winner, I am afraid you have to read the comparison chart by yourself to come to a conclusion, since this is just a comparison and not a competition. It seems though, that most Windows Mobile browsers outperform Safari inÂ most aspects, especially inÂ Stability tests, Memory Management and of course Copy/Paste functions.