Both seem to not be able to remember settings. The Z10 was horrible, but this took a couple weeks to lose my outbound email settings.
Both seem to have real issues running a single source of notifications. The first losing entire apps this just not consistently reporting new mail or texts(which is a deal breaker) and is dysfunctional with Twitter, LinkedIn and Facebook is 50/50
I'm guessing it is just the state of Android, but I really do not want to be an iPhone user.