I did an evaluation earlier this year between the two. We needed the 3d engine but also needed native phone features. Meaning some screens of the app would be

I did an evaluation earlier this year between the two. We needed the 3d engine but also needed native phone features. Meaning some screens of the app would be Unreal/Unity and some would be native iOS. We couldn't even get Unreal to build as an embeddable library for a mobile app nor could we get it to build into anything that would run in a web browser despite more than a week of effort. We had Unity working for both use cases in under a day.