Mobile OS crash analysis firm Crittercism (Really? Who's naming this stuff?) has posted the chart above, which shows that as a percentage of crashes overall, the latest version of iOS claims the highest total. In fact, many versions of iOS show a large percentage of crashes, and clearly iOS overall seems more prone to have an app crash rather than Android.
Of course, there are quite a few qualifiers here. This data has been normalized, so we can presume that this isn't just a quirk of the numbers: There are likely more crashes happening on iOS devices than Android devices, and not just because there's more iOS apps being used (Crittercism says it monitored about 215 million app launches across all platforms, and there were three times as many launched on iOS, but again, this chart shows a percentage of all app launches).
So why more crashing? Crittercism suggests it's because iOS 5.0.1 had just released, while the latest version of Android had not yet arrived, and the new OS was causing more issues than usual in Apple's system. I would also suggest that iPhone users (who have likely paid more for their phones) tend to overtax their devices -- keep in mind this is just an app crashing, not the full iOS, and we've all done that once or twice, right? And as you can see, there's a fair amount of crashes on older iOS phones, which means customers might be running newer apps on older hardware, almost always a recipe for disaster.
At any rate, interesting figures. With so much more usage on iOS devices (both from skilled and not-so-skilled developers, and users of both types as well), it's not that surprising that there are so many more crashes. Have crashes on iOS seriously affected your user experience?