Check out Apteligent, better crash reporting as well as performance data, user behavior and business impact. As a bonus your data doesnt go into Twitter or Google's ad networks and it's COPPA compliant.
I heard great things about Apteligent, especially from larger apps and teams. Was Twitter using the data from Crashlytics for ads? I am not sure if there's a clear answer, but they are an ad company at the end of the day.