UE4 is free to use with the full list of features and you only have to pay royalty after getting your first $1 million from the project (and that's just the default case, you can always discuss custom license with an upfront fee, if you want to).

At the same time, each major version update is painless so you can upgrade your project during development to get new features. Later while working with Unreal, I've realized it has very consistent roadmap with constant improvements and adding new features. Blueprints are very helpful for beginners, C++ has a lot of 'syntax-sugar' - macroses, a lot of convenient in-engine types for everything.

And suddenly it clicked, everything works as I expecting, UI is clear and much more powerfull, no need to build custom tools to work on the game itself. Copy Google Mobile Ads iOS SDK to Assets/Plugins/iOS of Unity project All the google mobile ads unity plugin is imported as they should be All the google mobile ads ios sdk files are imported and I also checked GitHub to see that they are there I even checked that the specific file that the error say is missing (GoogleMobileAds.h) is there. After some time, I've decided to try UE4 despite there was a lot of rumors that it's 'heavy' or requires an AAA team. But never get it worked because of the clunky UI which is very hard to understand for a new user.

When I started to learn game development, I've tried to use Unity multiple times because it's the most popular option.

Googleadmob and unity cloud build