The information you are looking for is available on Xamarin's website - Is Xamarin.Forms right for your project?
, however, I will leave a short summary here as well.
If your application requires little platform-specific functionalities and you would like to concentrate on code sharing rather than custom UI, you should consider using the Xamarin.Forms approach.
On the other hand, as each platform has its specifications, you can take advantage of that and use the Xamarin.iOS
solutions to customize the user interface on each of them and also use platform-specific APIs.
So, basically, it is up to you and the specific requirements you have to decide which approach will be more convenient. I suggest you have a more thorough look at the Xamarin documentation for more information on the matter.
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