Seems iPhone is more stable for most (my personal perception - and I've never had any lock ups, malfunctions/app crashes in many many months), but the Android version seems to have always released features sooner or had more features/information. iPhone is my daily driver but I always tether an old pay as you go Android to my iPad mini and use that for monitoring the rider app and viewing Partner app for payout/tolls after trips. I prefer to leave my iPhone alone the entire time I'm out and dedicate that just to gUber activity.