What you have to deal with; * Xcode = iOS bugs + UIKit bugs * Xamarin = iOS bugs + UIKit bugs + different runtime, language, memory model abstractions + .NET

What you have to deal with; * Xcode = iOS bugs + UIKit bugs * Xamarin = iOS bugs + UIKit bugs + different runtime, language, memory model abstractions + .NET bugs + P/Invoke bugs & overheads + GC inter-op bugs & overheads + C# bugs + slow followup of platform updates * Xamarin Forms = iOS bugs + UIKit bugs + different runtime, language, memory model abstractions + .NET bugs + P/Invoke bugs & overheads + GC inter-op bugs & overheads + C# bugs + slow followup of platform updates + extra UI abstraction layers + lack of fine level controls & features