It depends, if you already know Java or Objective-C, then it doesnβt matter, but most people will have to "get up to speed" on one or the other or, possibly, both.
If you get up to speed for both, I would save Android / Java faster to learn and deploy. But there are a lot of people doing iPhone / Objective-C applications for the first time too.
If you have experience with a managed environment such as VB6 or .NET, you are more likely to feel like Java than Objective-C.
Disclaimer: I am a .NET developer with some Java experience. The only Objective-C I work with is reading it online.
Nate
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