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copied!<p>My hunch is that the companies you talked to simply are used to using Objective-C. That's where their skills lie, and that's the biggest reason why they would prefer not to deviate from their path. The other reasons can be argued both ways.</p> <p>It's true that no one can predict what Apple will do, but there's a <em>very</em> small likelihood that Apple will ban third-party toolkits & APIs like they did in the summer of 2010. That was only a short period of time, and they completely reversed that decision. Their current focus is on making app development easier, which means keeping the field open to alternative development methods. I think MonoTouch is safe.</p> <p>As for speed, C# generally produces very fast executables. They may not be <em>quite</em> as fast as Objective-C, but I doubt you'd notice a difference. I remember seeing a website somewhere that showed C# outperforming C/C++ in some tests, but that was in the .NET environment, not Mono... and unfortunately I can't find the reference anymore. I'll keep looking. But the bottom line on speed is that C# speeds are very good. It's not like BASIC vs C. More like Java/JIT vs C.</p> <p>C# gives you many, <em>many(!)</em> advantages over Objective-C, and they have been enumerated in other Stack Overflow answers, so I won't repeat them here. You can find them easily enough.</p> <p>I'm an obvious fan of MonoTouch, but I do have to say one thing: I think it's a mistake for companies to think that because they are fluent in C#/.NET that they will easily be able to develop and/or maintain iOS apps using MonoTouch. It's just not true, because MonoTouch is basically a C# layer over the CocoaTouch API, meaning that you have to learn the Apple way of doing things. You have app delegates and view controllers and all the UIKit stuff. There's a real learning curve there. But if you're fluent in C#, MonoTouch will be a huge help.</p> <p><strong>UPDATE:</strong><br/> I found the article on C# speed: <a href="http://www.codeproject.com/Articles/212856/Head-to-head-benchmark-Csharp-vs-NET" rel="noreferrer">Head-to-head benchmark: C++ vs .NET</a></p>

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