Unity is a more generic game engine, Unreal is more specialized. C# is an easier language for most. C++ (particularly UE's flavor) is more difficult. Unity is

Unity is a more generic game engine, Unreal is more specialized. C# is an easier language for most. C++ (particularly UE's flavor) is more difficult. Unity is much easier for a single person or small team. Unreal is designed in mind for teams with dedicated designers, artists, audio, engineering, animators, etc. For a long time, Unity fought to be anything more than just 3D Flash. It wasn't taken seriously. And for good reason. About a decade ago I worked on what was at the time considered to be one of the largest Unity codebases in existence. It was rough. Unity's come a long way since then.