I'm using some other crash report and analytics (in parallell, for different clients), and Flurry seems the best. Crashlytics is good for other things, like beta reporting, fast installation, and so on. But, in productive environments, I use, with no doubt, Flurry or Google Analytics. They seems more infalible to me, and they log a lot of info. The info on their crash reports are huge: For instance : In Android, you get the number of users that have the crash, the device, the carrier, a Java stack trace, the date and the time, and much more information. Similar in the iOS case.

Retroactive Data pulling on mobile retention/conversion data. I like the simplicity of the system and the ease of navigation.

It is better than Yahoo once was. Good support from the reps which is better than what Yahoo once was. The new tool allows for more options. As time goes on and the further Yahoo/Bing separate, I am confident that there will be more improvements and changes as the two engines compete for budgets from each other.