What to choose - Xamarin or Unity or C++Builder for developing a cross-platform 2D game?

Question

Game development

Language - C++ or C# doesn't matter.
Why is $1400 C++Builder better (or better?) than free Xamarin or Unity?
Application for iOS and Android.

Answer 1

C++Builder is an IDE. Xamarin is a framework (sort of). Unity is an engine (framework + editor + a ton of wrapping). They are VERY different things and you can't compare them.

Answer 2

Well, as it were, yes, these are completely different things, it is not clear how you can choose between them.
Among the above, Unity is just right for developing a cross-platform game, including 2D, including for mobile devices and not only

Answer 3

It is possible to compare Unity and PhoneGap + phaser.js (or the like). The second option is definitely free and very simple.