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With all the useful things you get from NSArray and NSMutableArray, why would you ever use a “C Style” array with Objective-C objects?
NSString *array[] = {@"dog", @"cat", @"boy"};
For short, fixed arrays, the availability of a nice compact initialization syntax (as you’ve demonstrated) can be nice. In certain cases, a C style array may also offer a performance benefit compared to using NSArray. Another thing that comes to mind is that NSArray doesn’t offer any built in support for multidimensional arrays, while multidimensional C arrays are easy.
And of course, there’s the fact that you can only store objects in NSArray, not C-primitive types, but you asked specifically about using C arrays with Objective-C objects.