Fabric was a much better analytics tool than Google Analytics.
It's better because:
Instant crash reporting reduces release time anxiety. iTunes and Google analytics need 24 hour collection period.
Fabric can offer Fastlane and Beta -- Toolkits that help deal with distributing builds to testers and releasing apps. Google has nothing to compete with here.
Whatever way Fabric seem to define active users and sessions they seem to produce more accurate reporting while Google numbers integrated with the exact same app produce higher more ego stroking numbers.