Visual Studio For Mac
According to the System Requirements for Visual Studio for Mac:


  
  NET Core SDK 1.1 is required to use .NET Core projects and features. It can be downloaded and installed separately, and requires Mac OS X
  El Capitan 10.11 or higher.
  Xamarin.Android requires the 64-bit Java Development Kit (JDK).
  Xamarin.iOS requires Apple's Xcode IDE and iOS SDK.
  Xamarin.Forms can target both Android and iOS platforms, given the requirements listed above.
  


It makes no mention of Xamarin Studio being required.